How to extract secret?

[Benjamin-Loison]

As opening externalBackup.xml in text provides a different format than usual for secrets.

DuckDuckGo single interesting result (none interesting proposed by Google):

• Strange xml format freeotp/freeotp-android#317

• Backup and Restore Codes freeotp/freeotp-android#20

• backup and restore issue (?) freeotp/freeotp-android#352

• Temporary option for export keys without encryption as workaround for #283 freeotp/freeotp-android#336

• Add a way to export your Token freeotp/freeotp-android#107

• Can't import from FreeOTP to FreeOTPPlus helloworld1/FreeOTPPlus#242

Should not change much but could try building and installing original app on my LineageOS Fairphone 4.

A dirty workaround for the moment consists in modifying the 2FA secret on the given website, once have accessed it thanks to current FreeOTP knowing it.