bootloader from sysex

[gega]

Hello

Having a Roland VG-88 bricked

I would like to recover the bootloader and its program found in the 6 update firmware files Roland (V2) (SysEx.mid)
the bootloader and its program will then be inserted them using a TL866A in the SMART 5 BOOT BLOCK MEMORY FLASH "E28F800B5B".
Sysex files are not compatible with this chip and being a French novice in programming can you tell me the procedure to achieve that.

Thanking you in advance for your help
I enclose a capture of a part of the firmware update files