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Vintage Synth Repair

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DigiTech RP20 (Valve) Effects Processor - help

2010-07-23 by eons

Hi,
Ok.. sorry, I know this is synth group but I need help and unit it old anyway.
I have this RP20 guitar processor client tried to update OS but got stuck in the way. I asked if power was turned off or there was a cut in the cabling during his update and he said no.
It powered up with all buttons lighted and black square characters shown at top line on LCD; unit looked 'locked'.
I removed the internal batt. and placed it back in and progressed slightly with display showing: "waiting for data".
I tried to load OS ver 1.05 (I have 1.10 and 1.15 for later) (through Midi In & Out) with DigiTech's update program but got message: "unknown procedure" on unit's display and "An incorrect SysEx Procedure ID was received" on computer.
Client contacted manufacturers he said and they quoted to "before taking off the eeprom, lift pin 2 of U48" and "you will have to re-solder the pin after the update is complete". I have done this with no good results as unit displayed "unknown procedure".
Does anyone in the group possibly have service manual and/or other OS updates for this thing please?
Unfortunately the eeprom looks surface-mounted with no socket and could be this has crashed/went faulty.
Thank you for any possible help you might suggest.
eons

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