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Thanks for your good suggestions Bart. I've now tried a bunch of them without success.   It's possible to enter the phone's hidden Test environment by powering off, then powering on with Power+UpVol+DownVol all pressed at the same time. There's a specific OTG test, which it passes when it detects an OTG cable attached (and fails when it doesn't). But the device, in normal use, doesn't seem to do anything with this capability! Even when an app is open and actively scans for a device on USB: it can't find any. (Onkyo HD Audio).    The "USB Diagnostic Test" app reports that it can't find any device, but indicates it might be possible to fix the problem with root permission..... There's no indication I can root this device: it's very new, having a build of July 2016, with a new Android build. It's not on a list of rootable devices in Kingo Root etc. So I'm afraid I might never get this to work properly. Take it back and ask for a refund?   Regards   ... Mehr anzeigen

I'll check out your suggestion. However, I'd failed to add that the portable DAC is battery-powered, and ignores the USB power lines from the phone! I'm supposed to use OTG cables, and I believe I am, but this phone doesn't even seem to recognise that a USB device is hanging off its USB port.  Yes, the E5005 does have a USB host port, and even supports 'accessory'. But I'm not sure all the firmware drivers are there. Perhaps I need to employ some kind of splitter cable, with a USB hub supplying a powered link to the phone, but an OTG cable connecting to the DAC. ... Mehr anzeigen

I forgot to mention: the normal process, if you have an unloadable phone, is to perform a factory reset. On Android, this means charging the battery first, then starting the phone with the Power On button AND volume up AND volume down all pressed at the same time. (Sometimes it's just one of the volume buttons). Press till it vibrates. It should load the bootloader and provide the factory firmware held in ROM. ... Mehr anzeigen

These smartphones aren't made by Medion directly. I have a Medion Life E5005, but when I load AIDA64, from the playstore, this reports that the device is made by Lenovo, model B5060, with Mediatek mt6735 hardware (quad ARM A53). By going to the Lenoveshop site, I can see the equivalent Lenovo B model (not the same screen however, but the rest seems the same).    You might try the German forum here: a lot of Germans who are technical, can speak very good English. Ask for someone to load AIDA64 on their x6001 and provide the manufacturers' information on System and CPU.    Note that firmware, for flashing, needs to correspond to the correct Country/Mobile Radio standards.    A good source for information is the xda-developers forum for lenovo. But this is a technical subject. Good luck. ... Mehr anzeigen