I am having problems updating my printer. the version is 184.108.40.206
The printer board is MKS SGEN_L V1.0 (LPC 1768)
The update using USB cable is giving an error of "time fail" and by SD card the printer doesn't recognise.
I researched and it seems that the "bootloader" is missing. Can you help me fix this problem so that i can update Marlin?
Thank you very much for your time!