Mega ISP: slowing down programming speed?

I've successfully built a MegaISP on a breadboard - and I could programm an ATtiny13. Unfortunately, I wrote some code to set it's clock really slow and now the MegaISP cannot programm it any more.

Is there a way to slow down the MegaISP?

Simple: prescale the clock. But probably that won't work.

Better solution: get a HV programmer or use an AVRISPmkII- Anything else is most likely a waste of time.


Prescaling the clock will break the serial communication, won't it?
Thanks for the links!

Depends on what you consider "breaking the serial communication". If you compensate it in your software it will not break the communication. If you do nothing about it it will of course break the communication.