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What is Casio doing? The boot code differs only in a few bytes: Timestamp and checksum.
Yet, it should work by directly modifying the on-calc updater.
Open the file OSRecover.SH3 with a hex editor and go to offset 0x90.
The following four bytes should read 0x006B2CE3 and be changed to 0x006B2CDE which is the BIOS checksum.
Then go to offset 0x9E and change the four bytes 0x31383532 to 0x31393130 which is the hour and minute timestamp.
The updater should no longer complain.
已经证明可以升级fx-9750gii OS ver 02.01.0700版 |
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