Can you fix a broken back office after a PrestaShop 1.7 → 8 upgrade?

Yes, this is a frequent request. After a 1.7 → 8 upgrade the back office can show white tabs, a missing menu, or dead AdminControllers because old overrides, a legacy theme, or incompatible modules didn’t survive the jump. We audit the upgrade, repair or remove the breaking overrides, update incompatible modules, clear the caches, and get admin fully usable again, ideally on a staging copy first.