Latest Mars Firmware Release - V4.2.19_LCDM /1440x2560 /F2.7

[cliffyk]

I have the serial M192xxxxx302 , which Model do I have?? M01?   Which firmware should I use?

System ChiTu L 5.5 Series
My current (original) fw is  V4.3.2_CFDF / 1440x2560 / F2.13

Your model (actually "release/version/series") is an "M19". 4.3.4 is the latest publiclly released by Elegoo--you can download it here.

However there is no real need to update as it is the same binary as your 4.3.2 version--it's just a relabelled public release of the that  production firmware...