This is for the C2 (I did this on .21, then updated to .29) - all official phones from the XA2 to the 10 III work with the normal instructions. My favorite test app Lidl Plus (country selection: Finland) crashes at favorite store selection when the map should be loading.
Recommended: install File Browser, Root Mode for File Browser v2+ and Patchmanager from Openrepos. Install the patch Launcher icon for android settings.
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First follow the directions for a complete removal of AppSupport. I did the “clean” version first and removed the directories the brute force way using File Br. (Root).
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Reboot
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Install AppSupport from Jolla Store, then check from Jolla Settings that AppSupport is running and Disable Android App-blah-blah-blah is checked.
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Download and install but do not open the latest versions of the three microG packages. Download and install but do not open F-droid. I used the browser to make sure that no settings are written behind my back.
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Open Android settings → Privacy → Permission manager → Spoof package signature. Allow spoofing for the two microG apps. To make sure the changes are saved, press the back arrow and return to Spoofing settings.
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Open F-droid and install Signature Spoofing Checker.
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Run Signature Spoofing Checker, tap Allow spoofing in the Sailfish dialog. If everything went fine, the test shows “Enabled” on a green background, and the Android settings show “Allowed”. If the steps are done in the wrong order, the checker fails but the settings show “Allowed”.
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Now is a good time to open microG settings → Self-Check. I can enable all except all locations (obviusly either only foreground or allow background), Show notifications and Appear on top of other apps.
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Continue with the mainstream instructions. In F-droid add the microG repo (to get future updates) and install Aurora Store.
There are probably a lot of extra steps.