Backup restore does not work on "unclear" stick, even after reflashing it with JFlash

[hacker-cb]

What happened

Backup is not restored on stick which was used before in other z2m instance, even it was reflashed with JFlash.

What did you expect to happen

Backup should be restored.

How to reproduce it (minimal and precise)

• Take new unclear stick which was used on other z2m instance before.
• Flash it with JFlash
• Stop z2m
• Extract old stick
• Insert new one
• Start z2m
• Backup will not be restored because hasConfigured is still true.

Why this happend

• JFlash does not erase NVMEM items.

Suggestion

• Add instance_id value which will be uniq for each z2m instance, for example 16-bit UUID.
• Save instance_id to configuration.yaml or to database.db coordinator entry.
• Save instance_id to coordinator NVMEM inside znpHasConfigured or to the new nvitem.
• Erase NVMEM if instance_id is different

[hacker-cb]

Here is function to erase all nvram items: https://github.com/jethome-ru/zigbee-herdsman/commit/b21bf0bf73d28e31a5b98e8ed6fe02153dba7b97

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days

[dmak]

Would be nice to have a code that erases NVMEM as part of Z2M.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days