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Writing the device's serial number
Unpack UpgradeDII Tool v1.35 and run UpgradeDllTool.exe.
On the tab SN be sure the Input Mode is on Manual. Copy the s/n (and optionally MAC) from
WNpctool and paste it to the UpgradeDLL tool.
Be sure the APPC-10DSK(P)(L) is turned off. Press the plus part of the volume control and plug in the
micro-USB part of the USB cable that is connected to your pc. Keep it pressed and simultaneously
turn the device on. The UpgradeDII tool will show "Found one Rockusb device".
Press "Write SN" and the device id (device type + serial number) will be written.
If successful restart the APPC-10SLB. To finalize the upgrade process perform a factory data reset:
Settings; System; Reset options; Erase all data (factory reset).
Congratulations, you have now successfully downgraded your APPC-10SLB to Android 6.0.1.
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