The higher the number, the newer the version. So for example A08 is newer than A07. Similarly, AC02 would be newer than AC01. Assuming one is made available, you could use AC02 to upgrade your firmware from AC01. Although, I suspect that the "AC02" firmware was only released as stock firmware on "TS-L633C" models that rolled out of the factory, not as a binary download you could get over the Internet. I have come to this conclusion after some extensive google-fu and viewing some dodgy websites that claim otherwise.
Update: Upon closer inspection I see that A07 and A08 appear to be DELL internal version numbers for their various laptop models. The A07 contains "L633CDW50.bin" (firmware DW50) and A08 contains "L633CDW60.bin" (firmware DW60). Both of these can be downloaded directly from DELL using the links below. The date stamps below are taken from the "Version.txt" files are most likely to be dates when the DELL update packages were created, and not necessarily when the firmware files were created. I have also included some info on what issues these upgrades are intended to fix. Also note that these DELL packages contain the TSDNWIN tool needed for doing the upgrade (1.00.c), in addition to the "TSDNDOS.EXE" tool for DOS.
Note that the automatic firmware download button no longer works. That's because TSST has been out of business since around 2016 and the servers have gone offline. But if you have the firmware image file you can use this tool to upgrade the drive. This is what the Toshiba help article would have you use.
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