[Help] PS3 40GB downgrade without bd drive

[Spado]

Hello guys !
I have this PS3 40GB which has no bd drive at all. It was on 3.55 but I bricked it trying to install 3.55.1 rebug.
So I unbricked it using downgrade with service mode to the 3.41o fw (3.56 spoofed). It went good.
Doing that procedure again with official 3.15 fw I would had to be able to get a legit 3.15 to be able to update to 3.55 after that, but the update fails..
Here is the update log:

manufacturing updating start
PackageName = /dev_usb000/PS3UPDAT.PUP
settle polling interval success
vflash is disabled...
boot from nand flash...
creating flash regions...
create storage region: (region id = 2)
format partition: (region_id = 2, CELL_FS_IOS:BUILTIN_FLSH1, CELL_FS_FAT)
create storage region: (region id = 3)
format partition: (region_id = 3, CELL_FS_IOS:BUILTIN_FLSH2, CELL_FS_FAT)
create storage region: (region id = 4)
format partition: (region_id = 4, CELL_FS_IOS:BUILTIN_FLSH3, CELL_FS_FAT)
create storage region: (region id = 5)
create storage region: (region id = 6)
Initializing
taking a while...
start Updating Proccess
Initialize elapsed time = 162 msec
check UPL
Check UPL elapsed time = 40 msec
check Package Size
get package size elapsed time = 8 msec
start Updating Package
Update packages num = 29
Update packages total size = 160699026
Update Package Revoke list
read package revoke list package (576 bytes) elapsed = 6 msec
update package revoke list elapsed = 107 msec
Update Package Revoke list done(0x8002f000)
Update Core OS Package
read core os package (5193774 bytes) elapsed = 349 msec
update core os package elapsed = 1723 msec
Update Core OS Package done(0x8002f000)
Update VSH Package
sys_memory_container_create() success(id = 0xc0effffe)
Update VSH's package : 1/21
read vsh package (2070 bytes) elapsed = 8 msec
decrypt and verify vsh package elapsed = 27 msec
write vsh package elapsed = 9995 msec
compare vsh package elapsed = 0 msec
Update VSH's package : 2/21
read vsh package (5616383 bytes) elapsed = 372 msec
decrypt and verify vsh package elapsed = 343 msec
write vsh package elapsed = 1789 msec
compare vsh package elapsed = 412 msec
Update VSH's package : 3/21
read vsh package (3357780 bytes) elapsed = 226 msec
decrypt and verify vsh package elapsed = 230 msec
write vsh package elapsed = 3098 msec
compare vsh package elapsed = 319 msec
Update VSH's package : 4/21
read vsh package (5240122 bytes) elapsed = 348 msec
decrypt and verify vsh package elapsed = 314 msec
write vsh package elapsed = 2921 msec
compare vsh package elapsed = 409 msec
Update VSH's package : 5/21
read vsh package (24029 bytes) elapsed = 9 msec
decrypt and verify vsh package elapsed = 27 msec
write vsh package elapsed = 1277 msec
compare vsh package elapsed = 9 msec
Update VSH's package : 6/21
read vsh package (9831317 bytes) elapsed = 650 msec
decrypt and verify vsh package elapsed = 284 msec
write vsh package elapsed = 12692 msec
compare vsh package elapsed = 478 msec
Update VSH's package : 7/21
read vsh package (8662380 bytes) elapsed = 541 msec
decrypt and verify vsh package elapsed = 274 msec
write vsh package elapsed = 17705 msec
compare vsh package elapsed = 486 msec
Update VSH's package : 8/21
read vsh package (8657372 bytes) elapsed = 545 msec
decrypt and verify vsh package elapsed = 363 msec
write vsh package elapsed = 6316 msec
compare vsh package elapsed = 460 msec
Update VSH's package : 9/21
read vsh package (10445426 bytes) elapsed = 691 msec
decrypt and verify vsh package elapsed = 256 msec
write vsh package elapsed = 5769 msec
compare vsh package elapsed = 480 msec
Update VSH's package : 10/21
read vsh package (10252830 bytes) elapsed = 681 msec
decrypt and verify vsh package elapsed = 264 msec
write vsh package elapsed = 9269 msec
compare vsh package elapsed = 488 msec
Update VSH's package : 11/21
read vsh package (9922968 bytes) elapsed = 627 msec
decrypt and verify vsh package elapsed = 255 msec
write vsh package elapsed = 7341 msec
compare vsh package elapsed = 478 msec
Update VSH's package : 12/21
read vsh package (8214459 bytes) elapsed = 548 msec
decrypt and verify vsh package elapsed = 202 msec
write vsh package elapsed = 6171 msec
compare vsh package elapsed = 396 msec
Update VSH's package : 13/21
read vsh package (9428094 bytes) elapsed = 629 msec
decrypt and verify vsh package elapsed = 248 msec
write vsh package elapsed = 5517 msec
compare vsh package elapsed = 453 msec
Update VSH's package : 14/21
read vsh package (7973335 bytes) elapsed = 535 msec
decrypt and verify vsh package elapsed = 348 msec
write vsh package elapsed = 14550 msec
compare vsh package elapsed = 468 msec
Update VSH's package : 15/21
read vsh package (9766737 bytes) elapsed = 653 msec
decrypt and verify vsh package elapsed = 362 msec
write vsh package elapsed = 18586 msec
compare vsh package elapsed = 543 msec
Update VSH's package : 16/21
read vsh package (9199234 bytes) elapsed = 616 msec
decrypt and verify vsh package elapsed = 409 msec
write vsh package elapsed = 24923 msec
compare vsh package elapsed = 710 msec
Update VSH's package : 17/21
read vsh package (7260896 bytes) elapsed = 492 msec
decrypt and verify vsh package elapsed = 288 msec
write vsh package elapsed = 15736 msec
compare vsh package elapsed = 711 msec
Update VSH's package : 18/21
read vsh package (6563380 bytes) elapsed = 447 msec
decrypt and verify vsh package elapsed = 158 msec
write vsh package elapsed = 2002 msec
compare vsh package elapsed = 369 msec
Update VSH's package : 19/21
read vsh package (6092245 bytes) elapsed = 417 msec
decrypt and verify vsh package elapsed = 230 msec
write vsh package elapsed = 1512 msec
compare vsh package elapsed = 421 msec
Update VSH's package : 20/21
read vsh package (9859067 bytes) elapsed = 662 msec
decrypt and verify vsh package elapsed = 241 msec
write vsh package elapsed = 2282 msec
compare vsh package elapsed = 515 msec
Update VSH's package : 21/21
read vsh package (6492084 bytes) elapsed = 420 msec
decrypt and verify vsh package elapsed = 324 msec
write vsh package elapsed = 18719 msec
compare vsh package elapsed = 698 msec
Update VSH Package done(0x8002f000)
Bul-ray Disc Player Revoke
read bdp revoke package (1904 bytes) elapsed = 21 msec
decrypt and verify bdp revoke package elapsed = 33 msec
write bdp revoke package elapsed = 2390 msec
compare bdprevoke package elapsed = 59 msec
Bul-ray Disc Player Revoke done(0x8002f000)
Update Program Revoke list
read program revoke list package (704 bytes) elapsed = 8 msec
update program revoke list elapsed = 308 msec
Update Program Revoke list done(0x8002f000)
move_2block_status_into_the_region(): region id = 3
rewrite_region() region id = 0x3, start_lba = 0x0, end_lba = 0x4000
rewrite region done (ret = 0x8002f000)
rewrite region elapsed time = 1026 msec
touch_1st_sector_in_block() region id = 0x3, start_lba = 0x0, end_lba = 0x4000
touch_1st_sector() done (ret = 0x8002f000)
touch_1st_sector() elapsed time = 1229 msec
rewrite_region() region id = 0x3, start_lba = 0x0, end_lba = 0x4000
rewrite region done (ret = 0x8002f000)
rewrite region elapsed time = 1028 msec
Update BD firmware
read BD firmware package (1966992 bytes) elapsed = 148 msec
update BD firmware elapsed = 29908 msec
Update BD firmware done(0x8002f14e)
update package elapsed time = 251404 msec
Updating or Verifying failure 0x8002f14e
UpMng.UpdatePackage() failure
manufacturing updating FAILURE(0x8002f14e)
Total Elapsed time = 253434 msec

So now I'm stuck only being able to restore with that 3.41/3.56 spoofed but I can't update to 3.55 rebug or to any other fw.
What can I do? Is there any other pup which bypasses the bd drive control?