file format of the original firmware.

[piberry]

for whatever reason i´m unable to flash the lcd to version 1.5 for printing directly out of cura. all looks good first but then i´m stuck at the monoprice logo and after powercycling, the printer is still on 1.4.2
it is possible to flash the esp32 chip with an arduino but since the lcd firmware comes as an .efm file, i cant do it. opening the file in a text editor reveals the file header which is WFM1.0 but i have no clue what file format it actually is and how to continue from here, if possible at all.

[piberry]

nvm, found the answer.

[ansonl]

@piberry Do you have any references for the WFM1.0 format? I'm trying to look at the LCD firmware as well but could not find any thing on WFM1.0. Thanks.

[piberry]

@ansonl go here and download factory_app_v1_5.bin. Compare against the original LCD.efm (v1.5). In short: the bin file is embedded inside the efm file. Via comparing with a hex editor, you find out what part needs to be erased at the beginning and the end of the efm file to obtain the bin.