Upgrades to v2021.1 and later releases are only supported from releases v2018.2 and later. This is due to migrations that have been removed to simplify maintenance.
- The Tunneldigger VPN provider was not registered with the Gluon VPN backend, resulting in broken Tunneldigger configurations.
- Disabling Radio interfaces in v2021.1 could lead to nullpointer dereferences in the respondd airtime module, as the survey returns no data in this case.
Known issues
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* Upgrading EdgeRouter-X from versions before v2020.1.x may lead to a soft-bricked state due to bad blocks on the NAND flash which the NAND driver before this release does not handle well.