🐛 [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.