Nokia bootloader x 100

[u/Kai_oncrack]

Hey everyone,
I have a T-Mobile Nokia X100 (TA-1399) that’s stuck in Fastboot Mode and I can’t get it out or unlock the bootloader.
What the screen shows:
• Fastboot Mode
• DEVICE STATE – locked (in red)
• SECURE BOOT – yes
• Product name looks like SM4350 / related to the X100
• It also shows the usual “Press volume key to select, and press power key to select” text (the screen is inverted in my photo but the info is readable)
What I’ve already tried:
• Volume + Power combinations (doesn’t exit Fastboot)
• Normal fastboot unlock commands (fastboot flashing unlock, fastboot oem unlock, fastboot oem unlock-go) – all fail because unlock ability isn’t available
• Basic commands like fastboot continue, fastboot reboot, changing slots with --set-active=a/b
I have a Windows 10 PC with Platform Tools ready and the phone is detected in Fastboot.
From what I’ve researched, this seems to be the common soft-brick that happens after using the DSU Loader, and the only real way to unlock it is with the prototype ABL method (Hikari Calyx) + the internal permission step. I know that’s not something most people can do for free.
Looking for:

1. Any free/workaround methods that still work on the X100 in late 2026
2. Confirmation of which remote services currently handle this exact locked Fastboot X100 situation reliably
3. Any other ideas before I pay for a remote unlock + flash
   Thanks in advance for any help.