Lexmark Printers Firmware Extraction - Part A

This Medigate Labs report documents a hardware-focused investigation into Lexmark MS811n printers: identifying encrypted firmware via entropy analysis, examining serial and JTAG interfaces, and ultimately extracting the NAND flash by de-soldering and reading it with a universal programmer. The write-up explains the flash structure, block/spare-byte behavior, and practical steps and tools used during firmware extraction, concluding that direct flash reading is the most effective extraction method.