I always run into Invalid IMEI/no signal problems when downgrading to 4.3 (JB) from 4.4.2 (KK). Tried everything in the book. Even KNOX resets with ease. The only thing which works is restoring EFS and MODEM/RADIO from my N900XXU**** backup. Of course I'm once more plagued with dropped signal strength and GPS issues ince I do that.
ANY USEFUL help would be much appreciated
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