Ok I now tried again because I thought that the cable might be broken but I had the same problem with an other cable.
- tried two different cables - started install_giveio (also tried with totalio) - tried both joystock ports - tried two computers (Toshiba sp2100 laptop and a current Dualcore PC) - put LPT port to SPP mode
What else can be the problem?
I used the same version of dtvtransplus on the DTV and PC, and I enter "dtvtrans sync myimage.bin"
Then it starts to read and sync. It also flashes two times but then I only get a blue screen with ready (before that i quickly see some scewed chaos sings on the screen). Sometimes it also stops before but flashing two times was as far as i could get.
I had problems with having too long cable between PC and DTV. Shortened the cable to ~0.5 meter, but still having occasional transfer errors. Maybe using flat cable instead of round cable would be better...