[request] change of wifi AP SSID

On (at least) the A7S2, the embedded wifi access point for smartphone sharing seems to be controlled by these backup.bin setting IDs:

/ # bk.elf  r 0x013e0018
id:013e0018 size:33 data:
44,49,52,45,43,54,2D,57,47,45,30,3A,49,4C,43,45,2D,37,53,4D,32,00,00,00,00,00,00,00,00,00,00,00,
00,
/ # bk.elf  r 0x013e0006
id:013e0006 size:200 data:
44,49,52,45,43,54,2D,57,47,45,30,3A,49,4C,43,45,2D,37,53,4D,32,00,00,00,00,00,00,00,00,00,00,00,
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,
00,42,4C,68,6E,33,79,48,32,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,
00,00,00,00,00,00,00,00,
/ # bk.elf  r 0x013e0016
id:013e0016 size:9 data:
42,4C,68,6E,33,79,48,32,00,

0x16 is the password, 0x18 the SSID, and 0x06 seems to be a combination of both + an unknown checksum. I would advise everyone to back up the original values - I believe the lone 0x04 byte is a checksum of some kind, and if you change any of the three values, run bk.elf s, and reboot, then the smartphone sharing will fail with "System Failure" and halt the system in a way that forces to remove the battery.

In addition, at 0x013e0027 there is the DHCP daemon's lease file.

If anyone knows

how to keep the wifi and telnet/adb permanently active even during normal operation (i.e. when one exits the OpenMemories app),
if the UART pins on the Multi Connector can be used for a console or a bootloader in case one messes up with the system files (according to the Level 3 Service Manual, the pins map directly to the CPU, and the UART input also to BOOT_SERIAL_IN, so it should be possible) and where to get Multi Connector breakouts in Europe
how to change the SSID - the channel is set to auto-select by /android/data/system/wpa_supplicant_p2p.conf, and I am afraid my Samsung tablet doesn't see the wifi at all due to the colon in the SSID (my Macbook and HTC phone, however, do see and connect to the wifi). As mentioned I suspect there being some checksum in the wifi settings.

I would be very thankful.

ma1co / OpenMemories-Tweak

[request] change of wifi AP SSID #274