Would the master checksum be correct doing option b below on a hitachi?
Well that depends on how you restore it, if you use Garyopa Restore.bat then the Checksum it is not back to original, it stays on Master Checksum, you can do the following command to patch the original checksum:47flash e original-e.bin 9003e000 1000
where 47flash is the flash program for the 47D version, CAUTION, there are several flashers depending on your drive version (47,46,59, etc) , if you are unsure because you can not find it on the folder of the garyopa release, then ASK here. And "e" is the letter of your drive (dont copy paste it, see wich letter is your hitachi drive), and original-e.bin is the name of your original firmware. TAKE note that this should be an ENCRYPTED IMAGE because if you use the image that the FLASH.bat gives you that is an UNENCRYPTED image, so you must do a firm e original.bin original-e.bin
Garyopa does not patch the original checksum to give an extra safety measure in case of your drive not being 100% fully restored. (It will work ok with the master checksum indeed).
In case of the Birdy Friendly Flasher it does a full restore including your original checksum, so it is 100% in stock version.
What do you guys think? Microsoft has already started to block modded xbox360 units from accessing XBox Live!
At this moment it is possible to play online with the hacked firmware, but if you want to be 100% secure then un-mod it.
Wait, why do you purchase it modded in first place?, you surely have payed more than an original unmodded xbox value !!!