@nexus76 018A4.FD.DEC should contain both BIOS & EC dump; you need to read the EC chip content first & compare with the decrypted image to get the exact offset. LatinMcG or BDMaster can help you with this. On the other hand, the USB recovery should work - please try with the 018A4.FD.DEC (rename & rearrange properly). I've recovered many HPs, never faced any problem.
ok, I'll try it once more before disassembling the device completely, but as I mentioned, the usb stick isn't even accessed, fat16 or fat32, what's the correct filesystem you used?
@nexus76 Your naming convention is correct, but you need to put them in: Code: X:\Hewlett-Packard\Bios\Current
the only problem ive had is bad chipset bga solder on some needing reflow.. would not light usb. research if this mobo is one of them.
hey thanks LatinMcG, can I flash the decrypted bios binary directly via SPI or is there a special offset for EC code?
this device really has at least 3 ROM chips: UH2: SPI Flash ROM (4MB) / MX25L6405DZNI-12G UH5: ??? (2MB) / ??? (besides UH2) SPI ROM (256KB) / MX25L2006EM1I-12G I guess EC binary is just for peripheral ROMs, let's see.
CH341A and desolder chip if it cant be read on board with Pomona/3m test clip SOP8. make 3 backups and compare them if reading on board as sometimes it doesnt read right intermitent and has to be desoldered. make backups either way and compare with hexeditor like HxD and you will find what you need to flash. the Intel Management engine might need Cleaning.