aha, i see.
it is possible to do if:
1. you have a working MR-J2S-350A-S011 drive to read the firmware from.
2. your standard MR-J2S-350A has a FLASH CPU. see
http://yurtaev.com/mr-j-faq.html
drop me an email at the above link, i will send you a utility which can read the firmware. you'll need a windows pc with MR-CPCATCBL serial cable (the same used for MR Configurator)
if the firmware can be read, i will convert it fo intel hex format which can be used with SHFlash utility to flash the new drive
also, you need to read all 255 parameters from the -S011 drive using MR Configurator. to do it, set param No.19 to "ABCD", reboot the drive, read params and save em to a file