HemaPrince Honor Student
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hp 4540s bios downgrade & AMD card not working

HP ProBook 4540s Notebook PC

hello hp community

i need some help to downgrade bios to version 55.1 from F.61 Rev.A i have tried many methods but seems useless

1- windows installer said that version is lower than current and deny it

2-boot from efi update failed before it even start 

3- tried combination of WIN+B with Power keys but screen remains black ( i already wait 5 min not only 40 seconds)

i tried every method that was mentioned in topics related to my problem with same model 

 

the main purpose to do this is the AMD 7650m card is not working what ever i do , when install it an error appear with title like "video tdr failure atikmpag.sys", but on bios v55 worked like charm 

 

btw i tried many drivers for amd (old or new , the same problem appear)

 

thanks 

 

 

 

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Tutor Guille_HLP Tutor
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hp 4540s bios downgrade & AMD card not working

Hi HemaPrince.

 

 

Let´s try a combination between number 2 and 3. Meaning, store required BIOS as EFI file on the flash drive and then start laptop using WIN + B (hold them) and the push power button (no need to hold it).

 

It could do the trick, let me know.

I am an HP employee
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AlexandrLastFM Honor Student
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hp 4540s bios downgrade & AMD card not working

No way to downgrate! Please help!

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