The "SERVICE" issue in XR XS & XS Max Batteries | is APPLE taking part lock down TOO FAR?
138.7 هزار بار بازدید -
5 سال پیش
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On this Episode of the
On this Episode of the Art of Repair, Justin goes over a potentially HUGE Right to Repair issue concerning APPLE BATTERIES. Could this issue be more widespread and locked down in the next iPhone?
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BQ27546 Chips information sheet from Texas Instruments
https://www.ti.com/lit/ds/symlink/bq2...
Search the PDF for 8.3.5.3
CONCERNING EXCERPT FROM THE PDF BELOW
8.3.5.3 Key Programming (Secure Memory Key)
The bq27546-G1 secure-memory authentication key is stored in the secure memory of the bq27546-G1 device. If
a secure-memory key has been established, only this key can be used for authentication challenges (the
programmable data flash key is not available). The selected key can only be established/programmed by special
arrangements with TI, using TI’s Secure B-to-B Protocol. The secure-memory key can never be changed or read
from the bq27546-G1 fuel gauge.
8.3.5.4 Executing an Authentication Query
To execute an authentication query in UNSEALED mode, a host must first write 0x01 to the BlockDataControl()
command to enable the authentication data commands. If in SEALED mode, 0x00 must be written to
DataFlashBlock() instead.
Next, the host writes a 20-byte authentication challenge to the Authenticate() address locations (0x40 through
0x53). After a valid checksum for the challenge is written to AuthenticateChecksum(), the bq27546-G1 uses the
challenge to perform the SHA-1/HMAC computation in conjunction with the programmed key. The bq27546-G1
completes the SHA-1/HMAC computation and writes the resulting digest to Authenticate(), overwriting the preexisting challenge. The host should wait at least 45 ms to read the resulting digest. The host may then read this
response and compare it against the result created by its own parallel computation.
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★ Find all the tools I use on my NEW website! ★ HTTP://SHOP.ARTOF.REPAIR ★
If you are looking to purchase new tools for your shop, please consider supporting the Art of Repairs' new tool venture to help fund my repair shop world tour! Yours could be the next shop I visit!
The Art of Repair only travels where invited, to invite Justin to your shop during his travels please fill out the following form. https://forms.gle/6YJRF4Ge8WrA8T21A
And if you filled out the travel visit form previously, don't worry. I may be contacting you soon!
★ Got comments or Ideas?
★ Leave me a comment down below!
★ Shoot me an email [email protected]
★ You can text me too! 520-222-8089
PLEASE SHARE THIS VIDEO
BQ27546 Chips information sheet from Texas Instruments
https://www.ti.com/lit/ds/symlink/bq2...
Search the PDF for 8.3.5.3
CONCERNING EXCERPT FROM THE PDF BELOW
8.3.5.3 Key Programming (Secure Memory Key)
The bq27546-G1 secure-memory authentication key is stored in the secure memory of the bq27546-G1 device. If
a secure-memory key has been established, only this key can be used for authentication challenges (the
programmable data flash key is not available). The selected key can only be established/programmed by special
arrangements with TI, using TI’s Secure B-to-B Protocol. The secure-memory key can never be changed or read
from the bq27546-G1 fuel gauge.
8.3.5.4 Executing an Authentication Query
To execute an authentication query in UNSEALED mode, a host must first write 0x01 to the BlockDataControl()
command to enable the authentication data commands. If in SEALED mode, 0x00 must be written to
DataFlashBlock() instead.
Next, the host writes a 20-byte authentication challenge to the Authenticate() address locations (0x40 through
0x53). After a valid checksum for the challenge is written to AuthenticateChecksum(), the bq27546-G1 uses the
challenge to perform the SHA-1/HMAC computation in conjunction with the programmed key. The bq27546-G1
completes the SHA-1/HMAC computation and writes the resulting digest to Authenticate(), overwriting the preexisting challenge. The host should wait at least 45 ms to read the resulting digest. The host may then read this
response and compare it against the result created by its own parallel computation.
SHARE THIS VIDEO!
★ Find all the tools I use on my NEW website! ★ HTTP://SHOP.ARTOF.REPAIR ★
If you are looking to purchase new tools for your shop, please consider supporting the Art of Repairs' new tool venture to help fund my repair shop world tour! Yours could be the next shop I visit!
The Art of Repair only travels where invited, to invite Justin to your shop during his travels please fill out the following form. https://forms.gle/6YJRF4Ge8WrA8T21A
And if you filled out the travel visit form previously, don't worry. I may be contacting you soon!
★ Got comments or Ideas?
★ Leave me a comment down below!
★ Shoot me an email [email protected]
★ You can text me too! 520-222-8089
5 سال پیش
در تاریخ 1398/05/15 منتشر شده
است.
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