PB632 won't start after failed Wi-Fi firmware update attempt

[stopchan]

Maybe someone can recommend some solution for my problem with PB632 described below...

Problem:
Won't start after failed Wi-Fi firmware update attempt. A detailed description of the problem is provided below. I've also attached a screenshot with the error message.

Needed:
Software recovery and firmware update.

Assumptions about what the problem is:
The bootloader file was damaged during an unsuccessful firmware update. The device needs to be repaired with software (restore the normal boot file?).

Description of the problem:
Battery charge at the beginning of the action ~70-80%.
In the evening, I was started updating firmware via Wi-Fi up toversion from 20.12.2021 (version 3.5.xxxx, as far as I remember). The reader downloaded 25% of the file, after which the Internet connection was lost.
The next day, I copied the Cool Reader update (CR3-v0.0.6-17-62.1-Pro5-PB632) to the device flash-memory.
I restarted the process of updating the e-reader via Wi-Fi. The file quickly "downloaded" to 25%, then downloaded much more slowly to 100%. I didn't watch the entire update process - I went away. When I returned, the screen showed the inscription "[...] File read error [...]", after which the reader did not boot normally.

Tried and tested solutions:
1. Long press the power button when the e-reader is switched on (when the LED in power button is on) - the e-reader switches off (the button LED goes out), the screen does not update.
2. Long/short pressing the power button when the reader is switched off (when the LED is off) - the e-reader switches on (the LED lights up), the screen does not update. The e-reader can stay in this state indefinitely (the LED does not go out unless you switch device off).
3. Simultaneously pressing the < + > + power buttons - the reader switches on, after which the screen updates several times (several blinks of the blank screen, then the "front" PocketBook inscription, then the firmware update screen, then the screen with an error message), the reader switches off (the LED goes out). Although sometimes it may not switch off after an error message, which may be due to pressing a button during the update process.
4. All combinations of recharging/rebooting with connection to a charger/laptop and replacing the micro-USB cable do not give any new results. When connected to a charger/laptop with the cable, the reader boots up (the LED lights up). Charging for any length of time does not produce any new results.
5. Once (after being switched on overnight), a screen appeared with a warning about low battery power.

The only one the same problem I found on the Internet:
https://www.reddit.com/r/ereader/com...ting/?sort=new

The latest firmware:
https://download.pocketbook-int.com/....4078_user.zip

[neil_swann80]

Originally Posted by stopchan

3. Simultaneously pressing the < + > + power buttons

To confirm, was that:
Press and hold the Forward and Backward buttons simultaneously, then switch on the device without releasing the Forward/Backward buttons.

Can you access the user storage by USB?

[stopchan]

Originally Posted by neil_swann80

To confirm, was that:
Press and hold the Forward and Backward buttons simultaneously, then switch on the device without releasing the Forward/Backward buttons.

As I wrote before...

Originally Posted by stopchan

3. Simultaneously pressing the < + > + power buttons - the reader switches on, after which the screen updates several times (several blinks of the blank screen, then the "front" PocketBook inscription, then the firmware update screen, then the screen with an error message), the reader switches off (the LED goes out). Although sometimes it may not switch off after an error message, which may be due to pressing a button during the update process.

I already tried all of the known regular ways to back my e-reader to life.

Originally Posted by neil_swann80

Can you access the user storage by USB?

No. If it worked, there would be no problem.
This is the worst situation that I faced to with all of my e-books. And the first time when I want to PB632 had a microSD slot.

[nhedgehog]

Only solution I can think of is trying the UART method.

https://www.mobileread.com/forums/sh...d.php?t=360613

or the FEL method:
https://linux-sunxi.org/PocketBook_Touch_Lux_3#FEL_mode
https://linux-sunxi.org/FEL

Edit: But I didn't try it myself!

[nhedgehog]

Did you try the safe mode:
Home&L&ON - Safe Mode
L&ON - Safe Mode

There is a kind of reset function too but I did not explore it further though it deleted my touchscreen calibration:
Options&ON

[stopchan]

Originally Posted by nhedgehog

There is a kind of reset function too but I did not explore it further though it deleted my touchscreen calibration:
Options&ON

Only after this manipulation my PB632 has detected by Win11 as an Unknown Device. During this on/off button LED didn't blink or light up, and the screen didn't changed or blinked.
When I manually updated drivers for it to Mass Storage Device, then I seen icon in tray, but didn't seen new drive in the list of the disc drives (C, D...).

It seems like a right way, but I didn't know what can I do more.

I'm just advanced Windows user, not programmer. And I'm afraid to disassemble the e-reader by myself. So another methods with disassembling or for very advanced users are not for me.

[nhedgehog]

Sounds like the options&on starts the device in FEL mode. There is a special driver for that but I'm afraid, it will not give you the USB mass storage mode you are hoping for. With the limitation you have I guess repairing the device is beyond your abilities, since as far as I can see it, you need to solder 3 wires and use the UART port to try to get into it and even then I'm not sure this will lead to success.

[stopchan]

Originally Posted by nhedgehog

Did you try the safe mode:
Home&L&ON - Safe Mode
L&ON - Safe Mode

This 2 methods only turns the LED light up and nothing else.