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I'm trying to re-install Clockwork recovery mod (tl;dr: Android 2.3.1+ will reinstall stock recovery on every boot if it's not present).

I had installed it successfully yesterday, but today it does not go beyond

C:\android>tools\fastboot.exe flash recovery NexusS\kernel\recovery-clockwork-
< waiting for device >

The only difference would be that today the battery level is low ( currently at 20% and charging).

So does fastboot require the battery to be over a set level ?

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I can't find any info on this, but it's a good rule of thumb to have a well-charged battery before flashing anything. You should also try rebooting your device and PC and try again, sometimes it just doesn't take when the device is in an odd state. – Matthew Read Feb 22 '11 at 15:10
Agreeing with Matthew. I wouldn't flash anything with a low battery. – Bryan Denny Feb 22 '11 at 15:11
@MatthewRead Thanks, I've rebooted my device & PC but to no effect. – Sathya Feb 22 '11 at 15:12
Thanks @Bryan I'll wait till it gets charged and will post back. – Sathya Feb 22 '11 at 15:13
looking through the source of fastboot, I do not see anything that would suggest that the battery has to be a certain percent, although, like Matthew Read said, I wouldn't attempt it with a sub 50% charged battery. – Ryan Conrad Feb 22 '11 at 16:47

Turns out I was not in fastboot mode :| (yes, terrible mistake). I was able to flash after getting into fastboot mode.

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