F1 resident alien: Option to pay FICA tax back for June 2020-Dec 2022

I am on F1 visa since 2014. considered a resident alien for tax purposes since 2019. Stated work on OPT from June 2020 and FICA tax not withheld by the previous employer for June 2020-Dec 2022. Previous employer not willing to update W-2. 

 

  1. Am i liable for full 15.3%, since previous employer did not pay? 
  2. Can i use form 8919 and amend my tax return to pay FICA tax back for June 2020-Dec 2022?
  3. is there installment plan avaliable to pay the FICA tax for June 2020-Dec 2022