unable to erase mc9s12c64

[DME]

Hi, I'm newbee. What wrong with chip? I have mc9s12c64 chip. And PODEX BDM. I sucsesfuly  burned and erased some code . Also have tryed to build some "hello world projects" which worked OK. After last bunning uc didn't respond to bdm. I tryed different frequencies in hcs12mem and figured out chip respond to bdm on twice lower osc frecuency then it realy is. When I try to unsecure chip i get this:error: FLASH access error (ACCERR bit set)and then this: error: FLASH protection violation (PVIOL bit set) Is it sill possible to erase chip. 

[jsmcortina]

Do you have recorded the settings you used in the first place when you were able to erase the chip?

Be aware that according to the datasheet, using incorrect flash frequencies may damage the flash memory. 

I only have experience of the P&E and Softec BDM interfaces and both can inexplicably be very unreliable at times.

James