BQEVSW: bqevsw with ev2400 not read data flash

Pavel Sobolev

Part Number: BQEVSW
Other Parts Discussed in Thread: EV2400

Hello. I have ev2400, trying to raise the battery after a full discharge from the macbook a1502 on the controller bg20z45 v7.02. When I try to read the data flash program gives an error reading Data Flash Subclass Voltage, Code = 772

over 5 years ago

0 Batt over 5 years ago

TI__Mastermind 42535 points

Hi Pavel,

Your gauge is sealed. You need to get the unseal key so that you can access df. The df can't be accessed when sealed.

0 Pavel Sobolev over 5 years ago in reply to Batt

Prodigy 80 points

But how to do it? As far as I know, these batteries have the standard factory password.

0 Batt over 5 years ago in reply to Pavel Sobolev

TI__Mastermind 42535 points

To unseal go to the register window, in the write 2 word command box enter smbus command 00, word 1 to 0414 and word 2 to 3672, then click ok, your ss register flag should reset. Next send words 1 and 2 set to ffff and ffff. This should reset register flag fas. Now you can read your df.

0 Pavel Sobolev over 5 years ago in reply to Batt

Prodigy 80 points

After sending commands, the flags remain in place.

0 Batt over 5 years ago in reply to Pavel Sobolev

TI__Mastermind 42535 points

Hi Pavel,

That means your unseal and full access keys are different from defaults. You cannot unseal the gauge unless you know them.

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BQEVSW: bqevsw with ev2400 not read data flash