I've the same problem!
I've upgraded my PRS-T1 firmware from 1.0.05 to 1.0.07. Last week I decide to downgrade the firmware back to the 1.0.05 release in order to root it again.
I used the rescue_sd_1.0.05.
After that my reader freez every time I plug in my USB cable and wi-fi was not working (error).
I try to install the rescue_sd_1.0.06 and now wi-fi work fine but the T1 still freeze every time I plug in my USB cable.
Someone can help me restoring the T1 in order to work fine? every firmware release is ok for me now....
Second question: someone know if there are a way to authorize the T1 to the DRM without connect the T1 to the PC via USB (that does not work)?
Please every help was appreciated.
Claudio
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