Thanks @rik. Here are the detailed steps I used to successfully update my Pixel 4a5g unofficial build from Iode 6.7 to Iode 7.1 without losing data:
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Back up phone, just in case.
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Connect phone to computer via USB
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Open a terminal
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Confirm authorized ADB connection with
adb devices -
Download the IodeOS…zip file for the 7.1 unofficial Rik build onto computer
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Boot Pixel into recovery mode from computer terminal using
adb reboot recovery. This re-confirms adb connection and provides a clear path to Recovery Mode. -
Sideload the IodeOS…zip file.
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On the device, select “Apply Update”, then “Apply from ADB”.
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On the host machine, sideload the package using:
adb -d sideload /path/to/zip -
Wait for Pixel to show the “Signature failed” error. Choose “Yes” to continue to load anyway.
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Wait for Pixel to show “To install additional packages, you need to reboot recovery first. Do you want to reboot to recovery now?” Select NO.
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Select “Reboot System now” from recovery main menu.
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Check IodeOS system update information on the Pixel to confirm that the update was successfull.
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