[vicen]

hi, try changing the boot order in bios to the windows bootloader.

[vicen]

Juha Pirinen wrote:

Maybe it is the prommer… Elnec’s website says that beeprog+ supports that chip but no word of the oldest beeprog -model.

so close… well lets wait for the programer to arrive then

[vicen]

Juha Pirinen wrote:

NOT working. Erases, reads zero, ok. Flashes, verify fails, and the reason for verify fail is that only the start of the device range gets flashed, then its zero to the end. Laptoo says nothing, black screen. With original bios or the older one “jumper.rom”. WTF.

have you try to not verify?

[vicen]

Juha Pirinen wrote:

And problems… Reading works, erasing works but when I flash then verify fails. So flashing doesn’t work like intended. Maybe too long wires…

what rom are you trying to flash?? the original or the new one??

[vicen]

Juha Pirinen wrote:

It reads! And checksum doesn’t match with the “jumper.rom”… This is getting exciting!

my god! good luck!! how is it going??
ps: i think you and i have the same revision of laptop,  30/9 bios with sandisk 4064 emmc, right?? so, if you success i will try

[vicen]

Juha Pirinen wrote:

Well, that is cheap! I work daily with electronics so this is kind of a piece of cake. We do have eprommers at work but those are quite old, over 10 years or so.

PLEASE, report if you try fixing it!

[vicen]

John Smith wrote:

It is 3.3V chip, programmer is OK without 1.8V adapter. Clamp is useless, it is not a DIP chip, you have to do outwireing.

thank you very much, is nice to know that there is a solution if i fuck up downgrading…

[vicen]

John Smith wrote:

Yes, right! There is a whole for easy access on the black plastic plate. So 25Q80C, it is a 3.3V chip.

so, the CH341A should work ?? no adapter needed? maybe a ic clamp?

[vicen]

John Smith wrote:

25LB64

i think this is a little bit risky and i do not understand very well what steps you follow…maybe you could elaborate a bit

thank you in advantage

[vicen]

John Smith wrote:

Arrgh, remove pls that terrible green dot from the BIOS chip, i can not see the chip type.

I can not, that picture is not mine… sorry

[vicen]

John Smith wrote:

Nice, maybe i had luck. Successfully downgraded my V5 to V4 BIOS (unlocked) with that Jumper.rom file from Yepo’s guy via UEFI shell, as described in the read.me. Just updated boot block and main block nothing else. All files are in his Google Drive. If somebody can check BIOS EEPROM type from (8 pins black cube) the mainboard, i can tell you whitch external programmer is ok to recover the laptop.

wow, congratulations! what date was your bios??

by the way, i think that this is the bios chip, could you please tell us what is the correct programmer?

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[vicen]

Juha Pirinen wrote:

Booted efi shell and flashed the bios dated from August. Original bios was dated end of september. That’s it. Bricked. I’ll buy Lenovo Yoga next, I’m sick of these machines when you dont know what you get. This was very good laptop for the price IF there wasnt the keyboard lag… And that’s why I tried to flash older bios in the first Place.

did you check if the device id of both bios files (your dumped one and the new one) were the same?

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Juha Pirinen wrote:

Dont do it in the efi shell either. Just bricked mine. FUCK. Power button does nothing. Removed battery for awhile and now it turns on but screen stays black.

fuck! how did you do that??

 

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Lorenzo wrote:

Juha Pirinen wrote:

I’m interested in what stupid mistake you did? I have V4.5 with keyboard lag and I’m quite pissed with it. Going to flash V4 bios and hope it will fix that. Found instructions from the other thread. So in uefi shell just backup first and then flash jumper.rom. EDIT: Or is the jumper.rom the edited version for the yepo and the other jumper file the original and it must that one?

I tried to flash from windows with the exe utility, flashing in the uefi shell should be fine! I hope for success!

 

flashing the v5 bios from the uefi shell should work??

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Lorenzo wrote:

I just bricked my device trying to do so, I ‘m trying to recover now by reprogramming the EPROM after the bad flash. If I’ll get it to work I’ll try to write what I did and what went wrong so everyone can avoid my mistakes. Go easy on the bios!

sorry to hear that… did you try to update from 4 to 5??? if you bricked the bios maybe you need to reprogram it

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