The only officially approved TOS 2.06 upgrade for the STE and STFM.
The STFM version (known as the T-Board) is soldered directly on top of 68000 chip. The board requires the user to run a software program to switch to the newer version of TOS.
The STE version plugs directly on top of 68000 chip and uses a hardware switch to flick between the old and new versions of TOS.
- ST Format, issue 47, p33.
- Atari ST Review, issue 6, p51-53.