[Q] Clockworkmod recovery flashes then crashes

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http://forum.xda-developers.com – Hi, Recently tried to upgrade from CM10.1 to 10.2 nightly early September. Went ok until applied update.zip from 10.1 to the 10.2 ROM. Then all went tits up. Dropped calls, screen going blank. Decided to wipe data and cache and start again. Have got CM10.1 stable release and relevant gapps files on the SD card. Tried to flash CWM6 with Odin BUT when I boot into recovery CWM appears very briefly, but then screen goes blank. Tried to flash a stock recovery image from the Samsung GS3 Toolkit v7, but it can't cope with signatures on the CM10.zips. Get error: E: Failed to verify whole-fil (HowTos)