Reviving a "bricked" HV battery is possible but difficult - it involves issues with deeply discharged battery cells, internal hardware (the BMS unit and current sensor) and internal software (BMS firmware). They all need to be fixed to make the battery operational again. Opening the HV battery pack case is involved and this is strictly do-it-yourself - no mechanic will do it.
Do a search with terms like "brick battery". Start with this long thread:

EV battery replacement.
Hello, I have a 2014 Smart For Two electric with 20,000 km which I purchased a year ago for $10,000. The local MINI service center here in Toronto advised me yesterday that the EV battery needs to be replaced. The MINI center will be able to install it for around $1,200. The cost of the OEM EV...