Applications on the free plan in 3.x does not work anymore
We have an applications on the Backendless free plan in 3.x which is not working anymore because we have not migrated it to the version 4.x.
Can we still switch to a paid plan such as our application is working with 3.x again? In this case what plan should we select for? And until when the version 3.x will be supported?
Elsewhere what is the effort to migrate to 4.x?
Thanks for your help