QCA7500: Unable to flash firmware: "Failure (0xFF): Device refused request"

For some reason, I'm unable to flash my TL-WPA8630P V1 EU with a new firmware. The same command worked for flashing QCA75XX-2.13.0030.nvm, and the device works as it should, but I would like to upgrade the firmware. Any suggestions on how to make it accept the new firmware? Or how to make boot into bootloader mode so I can try with plcboot?

# plctool -P WPA8630P_V1_EU_2.2.3_unknown_origin.pib -N QCA75XX-2.13.0053.nvm
eth1 00:B0:52:00:00:01 Start Module Write Session
eth1 00:B0:52:00:00:01 Flash WPA8630P_V1_EU_2.2.3_unknown_origin.pib
RESERVED 0x00000000
NUM_OP_DATA 1
MOD_OP 0x11
MOD_OP_DATA_LEN 1423
RESERVED 0x00000000
MODULE_ID 0x7002
MODULE_SUB_ID 0x0000
MODULE_LENGTH 1400
MODULE_OFFSET 0x00000000
MSTATUS 0x0000
ERROR_REC_CODE 0
[...]
eth1 00:B0:52:00:00:01 Flash QCA75XX-2.13.0053.nvm
RESERVED 0x00000000
NUM_OP_DATA 1
MOD_OP 0x11
MOD_OP_DATA_LEN 1423
RESERVED 0x00000000
MODULE_ID 0x7001
MODULE_SUB_ID 0x0000
MODULE_LENGTH 1400
MODULE_OFFSET 0x00000000
MSTATUS 0x0000
ERROR_REC_CODE 0
RESERVED 0x00000000
NUM_OP_DATA 1
MOD_OP 0x00
MOD_OP_DATA_LEN 23
[...]
ERROR_REC_CODE 0
RESERVED 0x00000000
NUM_OP_DATA 1
MOD_OP 0x00
MOD_OP_DATA_LEN 23
RESERVED 0x00000000
MODULE_ID 0x7001
MODULE_SUB_ID 0x0000
MODULE_LENGTH 672
MODULE_OFFSET 0x02A00000
eth1 00:B0:52:00:00:01 Close Session
eth1 00:80:31:08:13:01 Failure (0xFF): Device refused request

If I dump the current PIB using -p, and try to flash with that one instead, I get the same:

# plctool -p dump.pib local
eth1 00:B0:52:00:00:01 Read Module from Memory
# plctool -P dump.pib -N QCA75XX-2.13.0053.nvm
[...]
eth1 00:B0:52:00:00:01 Close Session
eth1 00:80:31:08:13:01 Failure (0xFF): Device refused request

# plctool --version
plctool open-plc-utils-0.0.6 OSRQCA-929 ISO C Qualcomm Atheros, San Jose CA, USA

# plctool -a
eth1 00:B0:52:00:00:01 Fetch Device Attributes
eth1 00:80:31:08:13:01 QCA7500-MAC-QCA7500-2.13.0.30-01-20221117-CS (128mb)

# plctool -I
    PIB 0-0 21384 bytes
    MAC 00:80:31:08:13:01
    DAK 68:9F:07:4B:8B:02:75:A2:71:0B:0B:57:79:AD:16:30 (HomePlugAV)
    NMK 50:D3:E4:93:3F:85:5B:70:40:78:4D:F8:15:AA:8D:B7 (HomePlugAV)
    NID B0:F2:E6:95:66:6B:03
    Security level 0
    NET Qualcomm Atheros Enabled Network
    MFG Qualcomm Atheros HomePlug AV Device
    USR tpver_863111_170511_901
    CCo Auto
    MDU N/A

The pib and nvm files are both from this dropbox folder: https://www.dropbox.com/sh/hvl9jx1bj82xpne/AACdnHJIMq1ZD9gkHDlB_ykoa?dl=0 pib: QCA_Firmware/QCA75XX/pib_collection/Unknown_Origin/WPA8630P_V1_EU_2.2.3_unknown_origin.pib nvm: QCA_Firmware/QCA75XX/Firmware/2.13.0/QCA75XX-2.13.0053.nvm

qca / open-plc-utils

QCA7500: Unable to flash firmware: "Failure (0xFF): Device refused request" #178