Which rescue image? Because the gm spark reloaded use the STi7111 instead of the STi7162...

If normal flashing works, try this [Sti7111] Rettungs-Image GM 990 + Reloaded v1.2.65

I have said this 100 Times.
But one more time is also OK.
Please do the Following.
-------
Withe the problem you have goto Werks-Reset.
Now set the new firmware you have loaded to ( DEFAULT ) 3rd from the Top.
Now restart your box and goto the Spark online Download. ( Spark Icon ) Top Right.
You should now see all 7 lines Highlighted

Dear ramicn,
only the software version 1.2.65 or higher can connect to the Spark online service.
Please update over USB to the last software version, it is the 1.2.72.
For your GM Spark reloaded you can find it here.
cynextra.com/downloads/Software/

Werk is German for factory... so if there is a menu entry/ponit like 'factory reset' or 'factory restore' or something like that, try it ...

Take Oscam.

I don't know, not really sure, but perhaps this works at the reloaded too, but you have to change the config because of 1x instead of 2 x Conax ...
[OScam] oscam-ymod v18t44 for Sparkfirmware

No support for CS and keys!

If you have a local card, then use MCAS.