crwdns2934241:0crwdne2934241:0 Hermann Ruckerbauer
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in my case the sim card reader had broken Ground solder joints. The signal solder joints looked good, but on the GND joints there was clearly a gap. I resoldered it, and on the first boot it worked .. lets see how long.. but you need to be well equiped with soldering equipment to do this job. Hermann
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open