XIAO ESP32-C6 gives: "Unexpected error: Error while writing flash: Packet content transfer stopped (received 2 bytes)"

[mi-hol]

I'm new to the world of ESP32 and bought a Seeed Studio XIAO ESP32C6 with 4Mb flash. Tried to flash on Windows 11 (winver details below).

1. tried to flash "released Tasmota for 4MB Flash (english)" using WebInstaller but that was hanging at 15% complete
2. tried to flash this Tasmota C6 image using ESP_Flasher but this gave the error msg in title

I found a possibly related case here but couldn't make sense out of it as several topics got mixed there :(

Any suggestion how to get over this hurdle?

Details from Tasmota ESP_Flasher 3.0.3:

Console:

Using 'COM3' as serial port.
Unexpected error: could not open port 'COM3': PermissionError(13, 'Access is denied.', None, 5)

Progress window:

Using 'COM3' as serial port.
Connecting...
Detecting chip type... ESP32-C6
Connecting...

Chip Info:
 - Chip Family: ESP32
 - Chip Model: ESP32-C6FH4 (QFN32) (revision v0.1)
 - Number of Cores: 1
 - Max CPU Frequency: 80MHz
 - Has Bluetooth: YES
 - Has Embedded Flash: NO
 - Has Factory-Calibrated ADC: NO
 - MAC Address: F0:F5:BD:2C:F8:CC
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 1500000
Changed.
 - Flash Size: 4MB
Creating esp32c6 image...
Successfully created esp32c6 image.
Erasing flash (this may take a while)...
Chip erase completed successfully in 15.0s
Flash will be erased from 0x00000000 to 0x00003fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x0000e000 to 0x0000ffff...
Flash will be erased from 0x00010000 to 0x000d2fff...
Flash will be erased from 0x000e0000 to 0x002d9fff...
Compressed 13280 bytes to 9048...
Writing at 0x00000000... (100 %)
Wrote 13280 bytes (9048 compressed) at 0x00000000 in 0.2 seconds (effective 497.6 kbit/s)...
Hash of data verified.
Compressed 3072 bytes to 134...
Writing at 0x00008000... (100 %)
Unexpected error: Error while writing flash: Packet content transfer stopped (received 2 bytes)

Windows 11 details:

[mi-hol]

Update: My first unsuccessful attempt was with Chrome-based browser Vivaldi 6.9.3447.44 (Stable channel) (64-bit)

Success was achieved using Chrome 128.0.6613.138 (Official Build) (64-bit)

And after closing all Browser windows with ESP_Flasher too!

`Using 'COM5' as serial port. Connecting... Detecting chip type... ESP32-C6 Connecting...

Chip Info:

• Chip Family: ESP32
• Chip Model: ESP32-C6FH4 (QFN32) (revision v0.1)
• Number of Cores: 1
• Max CPU Frequency: 80MHz
• Has Bluetooth: YES
• Has Embedded Flash: NO
• Has Factory-Calibrated ADC: NO
• MAC Address: F0:F5:BD:2C:F8:C8 Uploading stub... Running stub... Stub running... Changing baud rate to 1500000 Changed.
• Flash Size: 4MB Creating esp32c6 image... Successfully created esp32c6 image. Erasing flash (this may take a while)... Chip erase completed successfully in 15.6s Flash will be erased from 0x00000000 to 0x00003fff... Flash will be erased from 0x00008000 to 0x00008fff... Flash will be erased from 0x0000e000 to 0x0000ffff... Flash will be erased from 0x00010000 to 0x000d2fff... Flash will be erased from 0x000e0000 to 0x002d9fff... Compressed 13280 bytes to 9048... Writing at 0x00000000... (100 %) Wrote 13280 bytes (9048 compressed) at 0x00000000 in 0.2 seconds (effective 529.5 kbit/s)... Hash of data verified. Compressed 3072 bytes to 134... Writing at 0x00008000... (100 %) Wrote 3072 bytes (134 compressed) at 0x00008000 in 0.0 seconds (effective 577.6 kbit/s)... Hash of data verified. Compressed 8192 bytes to 47... Writing at 0x0000e000... (100 %) Wrote 8192 bytes (47 compressed) at 0x0000e000 in 0.1 seconds (effective 813.6 kbit/s)... Hash of data verified. Compressed 797328 bytes to 535963... Writing at 0x00010000... (3 %) Writing at 0x000185e9... (6 %) Writing at 0x0001eded... (9 %) Writing at 0x00024e50... (12 %) Writing at 0x0002a2ed... (15 %) Writing at 0x0002facd... (18 %) Writing at 0x000357d4... (21 %) Writing at 0x0003ae34... (24 %) Writing at 0x000408e9... (27 %) Writing at 0x00045cdf... (30 %) Writing at 0x0004b72f... (33 %) Writing at 0x00051800... (36 %) Writing at 0x00057c1f... (39 %) Writing at 0x0005dce4... (42 %) Writing at 0x00063222... (45 %) Writing at 0x000690f8... (48 %) Writing at 0x0006ebc0... (51 %) Writing at 0x00074777... (54 %) Writing at 0x0007a479... (57 %) Writing at 0x0007fd30... (60 %) Writing at 0x00085f7d... (63 %) Writing at 0x0008bbb0... (66 %) Writing at 0x00091b59... (69 %) Writing at 0x00097aed... (72 %) Writing at 0x0009dee7... (75 %) Writing at 0x000a3eb2... (78 %) Writing at 0x000aa0a0... (81 %) Writing at 0x000b0080... (84 %) Writing at 0x000b633c... (87 %) Writing at 0x000bbfe1... (90 %) Writing at 0x000c1bf9... (93 %) Writing at 0x000c7632... (96 %) Writing at 0x000cd074... (100 %) Wrote 797328 bytes (535963 compressed) at 0x00010000 in 6.1 seconds (effective 1046.5 kbit/s)... Hash of data verified. Compressed 2072032 bytes to 1243029... Writing at 0x000e0000... (1 %) Writing at 0x000e808b... (2 %) Writing at 0x000efd55... (3 %) Writing at 0x000f8499... (5 %) Writing at 0x00100502... (6 %) Writing at 0x00109f91... (7 %) Writing at 0x00114441... (9 %) Writing at 0x0011f63d... (10 %) Writing at 0x0012bda5... (11 %) Writing at 0x0013580c... (13 %) Writing at 0x0013ff54... (14 %) Writing at 0x001497b1... (15 %) Writing at 0x00154ee1... (17 %) Writing at 0x00162d21... (18 %) Writing at 0x0016c96e... (19 %) Writing at 0x00174248... (21 %) Writing at 0x0017b1ea... (22 %) Writing at 0x001809bf... (23 %) Writing at 0x001862f2... (25 %) Writing at 0x0018bca8... (26 %) Writing at 0x00191362... (27 %) Writing at 0x00196d7c... (28 %) Writing at 0x0019cc0a... (30 %) Writing at 0x001a273c... (31 %) Writing at 0x001a7ff4... (32 %) Writing at 0x001ae0c5... (34 %) Writing at 0x001b3ab2... (35 %) Writing at 0x001b92df... (36 %) Writing at 0x001bf04d... (38 %) Writing at 0x001c5392... (39 %) Writing at 0x001cb187... (40 %) Writing at 0x001d1012... (42 %) Writing at 0x001d6a86... (43 %) Writing at 0x001dcaa9... (44 %) Writing at 0x001e2857... (46 %) Writing at 0x001e865b... (47 %) Writing at 0x001ee2c6... (48 %) Writing at 0x001f3fa2... (50 %) Writing at 0x001f998a... (51 %) Writing at 0x001feda5... (52 %) Writing at 0x00204e30... (53 %) Writing at 0x0020a94e... (55 %) Writing at 0x00210f98... (56 %) Writing at 0x00216ddb... (57 %) Writing at 0x0021c8c7... (59 %) Writing at 0x002222e7... (60 %) Writing at 0x002278ba... (61 %) Writing at 0x0022d3aa... (63 %) Writing at 0x002330a4... (64 %) Writing at 0x0023975b... (65 %) Writing at 0x0023f686... (67 %) Writing at 0x00245a5e... (68 %) Writing at 0x0024b533... (69 %) Writing at 0x00250d4f... (71 %) Writing at 0x00256b57... (72 %) Writing at 0x0025c7c8... (73 %) Writing at 0x0026271e... (75 %) Writing at 0x00268cf4... (76 %) Writing at 0x0026e31a... (77 %) Writing at 0x00273f03... (78 %) Writing at 0x00279413... (80 %) Writing at 0x0027ea93... (81 %) Writing at 0x0028449d... (82 %) Writing at 0x0028a913... (84 %) Writing at 0x00290482... (85 %) Writing at 0x00296600... (86 %) Writing at 0x0029c419... (88 %) Writing at 0x002a27bd... (89 %) Writing at 0x002a8892... (90 %) Writing at 0x002ae77a... (92 %) Writing at 0x002b4bec... (93 %) Writing at 0x002bab45... (94 %) Writing at 0x002c1842... (96 %) Writing at 0x002c75a7... (97 %) Writing at 0x002cd133... (98 %) Writing at 0x002d2d4f... (100 %) Wrote 2072032 bytes (1243029 compressed) at 0x000e0000 in 15.7 seconds (effective 1058.1 kbit/s)... Hash of data verified.

Leaving... Hard Resetting... Hard resetting via RTS pin... Done! Flashing is complete!

Showing logs: [13:57:37]00:00:00.160 SER: Set to 8N1 115200 bit/s [13:57:37]00:00:00.160 SER: HWCDC supports 115200 bit/s only [13:57:37]00:00:00.162 QPC: Reset [13:57:37]00:00:00.467 BRY: Berry initialized, RAM used 5548 bytes [13:57:37]00:00:00.474 Project tasmota - Tasmota Version 14.2.0.4(717bc01-tasmota32)-3_0_4(2024-09-17T19:51:07) [13:57:38]00:00:00.864 WIF: WifiManager active for 3 minutes [13:57:39]00:00:01.400 HTP: Web server active on tasmota-2CF8C8-7724 with IP address 192.168.4.1 [13:57:42] [13:57:42] [13:57:42]Core 0 register dump: [13:57:42]MEPC : 0x40806d18 RA : 0x420bac06 SP : 0x408227b0 GP : 0x4080e2c4
[13:57:42]TP : 0x40789be8 T0 : 0x420babde T1 : 0x40809bd6 T2 : 0x00000000
[13:57:42]S0/FP : 0x408176e8 S1 : 0x00000001 A0 : 0x00000001 A1 : 0x000000fe
[13:57:42]A2 : 0x00000008 A3 : 0x00000040 A4 : 0x4081e000 A5 : 0x00000000
[13:57:42]A6 : 0x00000000 A7 : 0x00000000 S2 : 0x408176e8 S3 : 0x4081e000
[13:57:42]S4 : 0x00000000 S5 : 0x00000000 S6 : 0x00000000 S7 : 0x00000000
[13:57:42]S8 : 0x00000000 S9 : 0x00000000 S10 : 0x00000000 S11 : 0x00000000
[13:57:42]T3 : 0x00000000 T4 : 0x00000000 T5 : 0x00000000 T6 : 0x00000000
[13:57:42]MSTATUS : 0x40821da8 MTVEC : 0x4081793c MCAUSE : 0x4081e000 MTVAL : 0x4214e162
[13:57:42]MHARTID : 0x00000000
[13:57:42] [13:57:42]Stack memory: [13:57:42]408227b0: 0x40821da8 0x4081793c 0x4081e000 0x4214e162 0x00000000 0x00000000 0x00000000 0x00000000 [13:57:42]408227d0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 [13:57:42]408227f0: 0x00000000 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xbaad5678 [13:57:42]40822810: 0x00000160 0xabba1234 0x00000154 0x40822730 0x2371ae2e 0x40817994 0x40817994 0x4082281c [13:57:42]40822830: 0x4081798c 0x00000019 0x4f575ccd 0x8b46d7d5 0x4082281c 0x00000000 0x00000000 0x40821f0c [13:57:42]40822850: 0x454c4449 0xdac52800 0x10758c39 0x00047c52 0x00000000 0x40822800 0x00000000 0x00000000 [13:57:42]40822870: 0x00000000 0x00000000 0x00000000 0x4081e52c 0x4081e594 0x4081e5fc 0x00000000 0x00000000 [13:57:42]40822890: 0x00000001 0x00000000 0x00000000 0x00000000 0x4214017e 0x00000000 0x00000000 0x00000000 [13:57:42]408228b0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 [13:57:42]408228d0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 [13:57:42]408228f0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 [13:57:42]40822910: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 [13:57:42]40822930: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 [13:57:42]40822950: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0xff000200 [13:57:42]40822970: 0xbaad5678 0x0000080c 0xabba1234 0x00000800 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822990: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]408229b0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]408229d0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]408229f0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822a10: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822a30: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822a50: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822a70: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822a90: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822ab0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822ad0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822af0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822b10: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822b30: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822b50: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822b70: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42]40822b90: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 [13:57:42] [13:57:42] [13:57:42] [13:57:42]ELF file SHA256: bf26f8e8c5505955 [13:57:42] [13:57:42]Rebooting... [13:57:42]ESP-ROM:esp32c6-20220919 [13:57:42]Build:Sep 19 2022 [13:57:42]rst:0xc (SW_CPU),boot:0x1e (SPI_FAST_FLASH_BOOT) [13:57:42]Saved PC:0x4001975a [13:57:42]SPIWP:0xee [13:57:42]mode:DIO, clock div:2 [13:57:42]load:0x4086c000,len:0xf80 [13:57:42]load:0x4086e610,len:0x21f8 [13:57:42]load:0x40875610,len:0x210 [13:57:43]entry 0x4086c410 [13:57:43] [13:57:43]00:00:00.000 CMD: Using USB CDC [13:57:43]00:00:00.001 HDW: ESP32-C6FH4 v0.1 [13:57:43]00:00:00.006 UFS: FlashFS mounted with 308 kB free [13:57:43]00:00:00.012 CFG: Loaded from File, Count 3 [13:57:43]00:00:00.014 SER: Set to 8N1 115200 bit/s [13:57:43]00:00:00.014 SER: HWCDC supports 115200 bit/s only [13:57:43]00:00:00.015 FRC: Some settings have been reset (2) [13:57:43]00:00:00.320 BRY: Berry initialized, RAM used 5548 bytes [13:57:43]00:00:00.326 Project tasmota - Tasmota Version 14.2.0.4(717bc01-tasmota32)-3_0_4(2024-09-17T19:51:07) [13:57:43]00:00:00.578 WIF: WifiManager active for 3 minutes [13:57:44]00:00:01.258 HTP: Web server active on tasmota-2CF8C8-7724 with IP address 192.168.4.1 `

[mi-hol]

Suspected root cause of error:

I had left the Vivaldi Browser Window open before I started ESP_Flasher! Likely WebInstaller window interferes with ESP_Flasher

1. Maybe this little detail should be mentioned in ReadMe?
2. Maybe the code could check for other processes accessing the same COM port as ESP_Flasher?

[Jason2866]

The check is there. See your log.

Using 'COM3' as serial port.
Unexpected error: could not open port 'COM3': PermissionError(13, 'Access is denied.', None, 5)

Clearly says could not open port 'COM3'

[mi-hol]

Clearly says could not open port 'COM3'

right, but from the message the necessary action to fix issue is not clear to a new user. This is the part I tried to express via "Maybe this little detail should be mentioned in ReadMe?"