Chip eeprom is corrupted. Thats why weird values were read. 

Posted by: @labifast

Everything was going smoothly until i tried to restored the eeprom backup I have taken as soon I tried to restore eeprom backup chip got locked

If everything was Ok why did you decide to write eeprom ?.. 

 It is absolutely not necessary step 

@djibattworkshop Battery has charging issue even battery and cell were new so I checked motherboard with another battery it was working fine . So now if you are satisfied why i have done this can you please suggest me a solution ?

thanks 

Posted by: @labifast

Everything was going smoothly

Posted by: @labifast

Battery has charging issue

 Things go a bit confusing. 

 Charge issue could not be resolved by writing same eeprom. 

In case of charge issue cells condition should be checked first. Then chip registers should be inspected. To understand the root cause of the issue. 

Posted by: @labifast

can you please suggest me a solution ?

 Chip is already bricked. There are two solutions but they could not be arranged remotely. Its need to send a battery to qualified workshop which has necessary tools. 

1. Replacing the chip using reflow station. Then reprogramming to fit specific Lenovo settings. 

2. Reflashing full SREC using bqRecovery software. 

@djibattworkshop Dear

let me explain even I have mentioned above,

When I SAID everything going smoothly I meant by that , I can charge battery with NLBA1 AND with laptop too , I can read chip I Can unseal and read EPROM but as soon I Tried to restore the backup of EEPROM that was originally belong to this chip it got bricked .

So now your question why I tried to rewrite the eeprom the  battery has intermittent charging issue .

1 : I checked laptop with another battery it was charging fine 

2 : I Had another same old battery I switch this BMS WITH that one and it started charging normally 

3: I checked the mosfet and rest of the component even I replaceD the  fuse and temprature sensing resister  I thought maybe after consistently flow of current trip the temperature sensing Thyrisister but still same 

4: at last I SWAP THE  CHARGING IC on both BMS WITH one another  AND obviously It was the issue THEN I went to rewrite the eeprom because there was nothing left to do because I wanted to do diagnostic where the problem lies is EEPROM causing this issue or Temp Control Circuit inside chip . 

5: The reason I raised this question and keen to get help I have done rewriting eeprom on another battery why this chip got bricked and possible solution .

6 : We always learn from our mistake and I am technician my job  is to do a proper diagnostic not to leave things on assumption .

So thank you .

 But why all this prehistory was not provided in the beginning of the topic ?.. 

It would be much clear the situation if all these steps with PCB swap was informed before. 

From what me understand you have installed the pcb from another battery. Then you replaced the "charging chip", then you reflashed it with unknown eeprom correct ?.. 

@djibattworkshop The case was very simple and I clipboard pic of required info in my 1st text that info was enough to proceed that NLBA1 Can be helpful to unbrick the chip or not .

Posted by: @djibattworkshop

From what me understand you have installed the pcb from another battery

 I Had another same old battery I switch this BMS WITH that one and it started charging normally .

now Maybe you will ask again if it was charging normally after replacing BMS "PCB" As you quoted then why I proceed further to swap chip , my answer is I wanted to figure it out is chip by hardware means malfunctioned or its Eeprom and I did spent enough amount on this device and on its license to pinpoint diagnostics related battery charging ICs solely  . 

Posted by: @djibattworkshop

Then you replaced the "charging chip", then you reflashed it with unknown eeprom correct ?..

Posted by: @labifast

I can read chip I Can unseal and read EPROM but as soon I Tried to restore the backup of EEPROM that was originally belong to this chip

I did explain everything  right now so did I got a solution I don't think ,  instead of getting a solution I Got more question to answer . 

Posted by: @labifast

NLBA1 Can be helpful to unbrick the chip or not

No. There is no unbrick option in the software. 

Hope your question is answered. 

Please remember some golden rules for battery repair 

- never write eeprom from unknown batteries 

- never write eeprom from different "charge chip"

- never write eeprom from same chip but different firmware version 

p.s. 

chips in the batteries are very sensitive. It is very easy to damage it but very difficult to recover