Below the post of the author on Atariage Forum.

A new firmware and flashtool is availible for Sys-Check V2 series.

The new flashtool now supports both Sys-Check PCBs equipped with a SST39SF010A flash chip (V2.1 and V2.2). When you start the flashtool, it will ask you which version you have. To be absolutely sure, the flashtool shows a simplified graphic view of both versions. I think, everybody can handle it :)

Of course the flashtool (and all other documents) are written in german and english.

Also there´s a new firmware V1.4 out. This firmware can be used with ALL Sys-Check versions – also with the old V2.0 (without flash). Owners of the V2.0 must burn the 16 KB firmware image into a 27128 EPROM. All other please use the flashtool to update their Sys-Check.

V1.4 has this minor changes:

• Sys-Check can be used with the U1MB expansion.
• The new version first checks the whole memory (to be more exact… the first 48 KByte) and then displays the defective bits (if there are any…)
• When bad memory within the first 48 KB is found, the upper 16 KB will not be tested.
• If memory is fine, OS-ROM will be tested as before.
• If both tests are fine, then pressing START after this will set Sys-Check into endless loop test mode. Memory and OS-ROM are tested infinite – until any error occurs.
• During memory tests the background will be coloured red if defective bits were detected.

Download: Sys-Check Firmware & Tools v2.2 (1065)

source: atariage.com