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fritzzzzzz

macrumors member
Original poster
Jun 16, 2020
47
13
what is the version of t2 in 10.15.7? mine is 18P50347c. I am wondering why the firmware is different. It should start with 17PXXXXXX
 

chrfr

macrumors G5
Jul 11, 2009
13,715
7,289
what is the version of t2 in 10.15.7? mine is 18P50347c. I am wondering why the firmware is different. It should start with 17PXXXXXX
You must have installed an early Big Sur beta on your computer at some point.
 

fritzzzzzz

macrumors member
Original poster
Jun 16, 2020
47
13
So now I can wait until big sur GM release ? T2 firmware cannot load back the old ones ?
 

chrfr

macrumors G5
Jul 11, 2009
13,715
7,289
So now I can wait until big sur GM release ? T2 firmware cannot load back the old ones ?
You can revert, if you have another USB-C Mac and install Apple Configurator. The process will delete all the data on your internal storage.
It would be easier to update to a newer Big Sur beta to at least get the beta firmware to a newer version.
 

bsbeamer

macrumors 601
Sep 19, 2012
4,313
2,713
FWIW - MBP16,1 with 10.15.7 (19H2) same firmware:

Controller Information:
Model Name: Apple T2 Security Chip
Firmware Version: 17P6610
 
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