🐛 [BUG] - <title> Dremel 3D20 cannot flash firmware

[Fred583]

Description

I have been trying to fix this printer with no luck. I cannot flash as the previous flash got corrupted and now I cannot get past the build on screen. I have tried to use an ST-Link, but I cannot find the bootloader byte that needs to be changed from 0x00 to 0xFF in order to update from SD. I can flash firmware through the ST-Link, but after restart I get the same problem.

Reproduction steps

I have no idea how to explain reproduction

Screenshots

No response

Logs

No response

Printer

Dremel 3D20

Marlin Version

2.1.2.1

Marlin Features

No response

[Fred583]

I can upload whatever file is needed, or if I need to flash a new bootloader that works too. But right now I'm running in circles trying to fix this.

[Fred583]

Okay just to continue the troubleshooting process, came across another issue that had the unlocked dreamer bootloader in it. Flashed it and tried every update process I could, and only got a white screen. So as of right now I'm still stuck with the backup of my locked bootloader with no idea where the trigger byte is.

[OneMonkeyArmy]

Sorry to answer with many months late... but if you want your printer back to life... I know every single bit of those boards....

I have revived dead (BRICKED) flashforge boards with a success ratio of 99.9%...

Even have a modified version of Bootloader for this particular problem...

Contact me on my emails:

daniel.massicotte@yandex.com
druidfirmware@gmail.com
or
dvamontreal@hotmail.com

[OneMonkeyArmy]

The bytes you are looking for are at the end of those 2 lines (address in HEX on the left)

But I am pretty sure that you did the mistake of erasing your unique encoded key that was written "just after flashforge12" and just before the 4 last bytes...

So you will need to use a modified bootloader, that can work with any firmware, but it no longer perform this test, that prevent the firmware to load at boot...

Contact me thru one of my emails (previously listed)... if needed I will send you a simple installer that will correct everything in your dead printer...

[Fred583]

The bytes you are looking for are at the end of those 2 lines (address in HEX on the left)

But I am pretty sure that you did the mistake of erasing your unique encoded key that was written "just after flashforge12" and just before the 4 last bytes...

So you will need to use a modified bootloader, that can work with any firmware, but it no longer perform this test, that prevent the firmware to load at boot...

Contact me thru one of my emails (previously listed)... if needed I will send you a simple installer that will correct everything in your dead printer...

I just emailed you. I appreciate your response!

[OneMonkeyArmy]

I have search my emails, but never saw yours... Anyway, what have you done and what do you need... I can solve any problem on a 3D20 ...

[Fred583]

If you have the unlocked bootloader that you can send me, that would be greatly appreciated. I am sure you are correct in saying the bytes are corrupted and I cannot change them. If you could provide a bootloader or installer, I hope that will fix it. Thank you again.

My email is fredsansoucie@outlook.com