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Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 4:27 AM

I am trying to downgrade my BIOS to an older version because the current version is incapable of manual fan speed control. The system is way hotter than it should be with no games running. I am not sure what the proper version is for fan speed control so I would like some help. I looked on the Lenovo Legion y740 page and I can't find any download links to old BIOS versions.

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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 6:02 AM

I have the same issue with my Lenovo 5Pi. I upgrade the last BIOS and even chipsets but it doesn't work and the processor still run with 4.3ghz as when i play whereas im just on internet. 

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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 11:09 AM

Have you both reset the BIOS to its default state after update?

 

@In5pire

 

the BIOS 1.08 is below

https://download.lenovo.com/consumer/mobiles/bvcn12ww.exe

https://download.lenovo.com/consumer/mobiles/bvcn12ww.txt - readme

 

BUT since v1.10 fixes a lot of security vulnerabilities (follow the readme file for v1.10), the BIOS downgrade can be unavailable. Anyway, enable the BIOS Back Flash feature in the BIOS Setup.



x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique hand-made config
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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 11:30 AM

Hey, thanks for your help. Yes i've reset the Bios with F9 but it doesn't work.

 

Do you have the Bios link for the Legion  5P-15IMH05H ?? The bug appeared with the bios just before EFCN39WW ! 

 

Have a nice day ;) 

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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 11:49 AM

Here you are EFCN38WW, on the support site, though with a bit trick to find

 

https://download.lenovo.com/consumer/mobiles/efcn38ww.exe

https://download.lenovo.com/consumer/mobiles/efcn38ww.txt



x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique hand-made config
ThinkPad 25 Special Anniversary Edition. #Retro. Signed by D.Hill
T470p | X1 Carbon Gen3 | Miix 2 10" | Yoga Tablet 2-1050F (Android) + BT Keyboard
ThinkPad Stack • 2.4/5 Wireless Router, HDD 1 TB, BT Speaker, Power Bank, Mobile Projector

Do it well, worse becomes itself

Communities:   English    Deutsche    Español    Portugues    Русскоязычное    Česká    Slovenská    Українська   Moto English

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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 13:01 PM

Is 1.08 the version that lets you control the fan? I think I actually have 1.079 right now and it doesn't let me control the fan. 

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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 15:35 PM
In fact i need the EFCN37WW please, others dont work and it still burn my cpu..
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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 22:59 PM

EFCN36WW 

readme

 

EFCN37WW seems a version for factory installation only, or buggy, isn't available in public



x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique hand-made config
ThinkPad 25 Special Anniversary Edition. #Retro. Signed by D.Hill
T470p | X1 Carbon Gen3 | Miix 2 10" | Yoga Tablet 2-1050F (Android) + BT Keyboard
ThinkPad Stack • 2.4/5 Wireless Router, HDD 1 TB, BT Speaker, Power Bank, Mobile Projector

Do it well, worse becomes itself

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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-18, 23:52 PM
Is that 1.06?
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Re:Legion y740-17IRHg How to Downgrade BIOS - HELP

2020-09-19, 0:29 AM
the number of version is EFCN36WW



x220 • Gobi 2000 3g | hdd, msata ssd, wwan, wifi, gps -- unique hand-made config
ThinkPad 25 Special Anniversary Edition. #Retro. Signed by D.Hill
T470p | X1 Carbon Gen3 | Miix 2 10" | Yoga Tablet 2-1050F (Android) + BT Keyboard
ThinkPad Stack • 2.4/5 Wireless Router, HDD 1 TB, BT Speaker, Power Bank, Mobile Projector

Do it well, worse becomes itself

Communities:   English    Deutsche    Español    Portugues    Русскоязычное    Česká    Slovenská    Українська   Moto English

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