Hi @alihosseini20368
Can you please let me know how you have created the backup means which plugin are you using and try import using it.
Please try disable below AIOS settings one by one and cross check.
1) 5g firewall rules – WP Security > Firewall > 6G Blacklist firewall rules tab. Enable legacy 5G firewall protection uncheck the checkbox and save
2) Deny bad query string – WP Security > Firewall > Addition firewall rules tab. Deny bad query strings: uncheck the checkbox and save
3) Advanced char filter – WP Security > Firewall > Addition firewall rules tab. Enable advanced character string filter :uncheck the checkbox and save
If still an issue and you are importing a whole old database Deactivate the all in one security plugin and try then activate. Before doing this please export the AIOS settings using WP Secruity > Settings > Import / Export – Export AIOS settings
Regards