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Xamp
Paper Tape
Posts: 2
Registered: ‎05-10-2018
Location: US
Views: 1,714
Message 11 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

If I have already upgraded to 4KCN43WW can I run this and change it back to 4KCN40WW without damaging anything?

cz0rt
Punch Card
Posts: 12
Registered: ‎01-30-2018
Location: PL
Views: 1,708
Message 12 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

enable in bios downgrade option and install old verision like other... work fine.
Xamp
Paper Tape
Posts: 2
Registered: ‎05-10-2018
Location: US
Views: 1,678
Message 13 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

Hey, so I tried to reasearch how to do this but couldn't find out how to enable the bios downgrade option. Does anyone know how to do this?

cz0rt
Punch Card
Posts: 12
Registered: ‎01-30-2018
Location: PL
Views: 1,674
Message 14 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

In bios Configuration/Bios back flash change enable/ save f10 and install file from previous page.

aciko
Paper Tape
Posts: 3
Registered: ‎05-11-2018
Location: MY
Views: 1,667
Message 15 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

Are there any changes in the new bios driver that has been updated on 11th May, the version is still 4kcn43ww

cz0rt
Punch Card
Posts: 12
Registered: ‎01-30-2018
Location: PL
Views: 1,646
Message 16 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

with 4kcn43ww (90°C) today update i have 10°C difference to 4kcn40ww (80°C) in fortnite ver i5 7300hq and gtx1050.

New update so hot, better option 40ww the same performance fps at me.

AM_Y520
Broadband 3G
Posts: 442
Registered: ‎01-31-2018
Location: LB
Views: 1,634
Message 17 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

aciko

I posted the 43WW changes here in the main post
aciko
Paper Tape
Posts: 3
Registered: ‎05-11-2018
Location: MY
Views: 1,609
Message 18 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

The initial update of 4kcn43ww was released at the end of April, yesterday I checked on Lenovo website, it was last updated on 11th of May thus lead me to the question is there any difference between the version release at the end of April and on 11th May? Both have the same version number which is 4kcn43ww and the release note are the same as your post
AM_Y520
Broadband 3G
Posts: 442
Registered: ‎01-31-2018
Location: LB
Views: 1,599
Message 19 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

yeah I saw that it's been posted agai with the same exact info !! I don't if it's better than before .. what's weird now is that my Vantage app doesn't see any updates available even though I'm still using 40WW version
Kuso_66480
Fanfold Paper
Posts: 9
Registered: ‎05-13-2018
Location: MY
Views: 1,530
Message 20 of 95

Re: DO NOT UPDATE BIOS 4KCN43WW ON LEGION Y520

Maybe this BIOS update is for certain batch of Y520 which there's a factory defect that the System will Freeze while the PC is running nearly idle and connected to AC Power , well after 20 - 30 minute this issue will show up and force You to reboot the system ( PS : My laptop is within this batch lol. ), after update the BIOS from 40WW to 43WW the freezing issue is gone for good .For the overheating issue it's quite normal,clean your Air Vent and use Laptop pad and Lagging issue is because the Intel Processor will thermal throttle to prevent damage to itself due to the processor is over 100°C, You can't disable it except Undervolt and turn off Turbo boost ( via Power Option ) to prevent Overheat (2.7 GHz is enough ) . I been gaming ( AAA Games like Rainbow Six Siege ) + doing assignment with my Y520 with no issue at all after some twerks Smiley Very Happy 

My Spec : 

Model : Y520-15IKBN made in 2017
BIOS : Come with 40WW updated to 43WW later
Processor : Intel i7 - 7700HQ

RAM : 2x8 GB - 16GB in Total
GPU : GTX1050
Storage : OEM

This picture show the setting I use Cat Surprised .
Capture.PNG

 
Comparision : With and Without Turbo boost 

Since the Undervolt will cool down Your Laptop for about 5 - 6°C, it doesn't help at all right? So here's the big deal of turning turbo boost OFF my dear Smiley Frustrated 

Picture below shows my laptop's temperature with Turbo boost off while playing AAA Games ( Extreme cooling : off )
Highest : 68°C Lowest : 66°C 

Turbo boost OFF.PNG

 For Part 2 please move to Page 3 Smiley Happy

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