You don't need to reflash the firmware, you just need to perform what's called a low-level format. This is different than a standard formatting that you see elsewhere.
IBM-SSG
IBM-SSGSSH51P9
E1A2
peripheral_type: disk [exe]
PROTECT=©
Unit serial number: HLK04EEJ0000822150Z3
LU name: 5000c500a181e568
mode sense (10) cdb: [5a 00 01 00 0e ee de ee fc ee]
lode Sense (block descriptor) data, prior to changes:
Number of blocks-3637089792 [exd8c99600]
Block size=528 [0x210]
mode select (10) cdb: [55 11 00 ee e0 de ee 0e 1C 00]
node select (10):
ixed format, current; Sense key: Illegal Request
Idditional sense: Invalid field in parameter list
Field replaceable unit code: 17
Sense Key Specific: Error in Data parameters: byte 13 bit 7
ry MODE SELECT again with SP=@ this time
mode select (10) cdb: [55 10 00 Ge ee ea Be Be 1c ee]
ode select (10) :
ixed format, current; Sense key: Illegal Request
dditional sense: Invalid field in parameter list
Field replaceable unit code: 17
Sense Key Specific: Error in Data parameters: byte 13 bit
ODE SELECT command: Illegal request, type: sense key, apart from Invalid opcode