@Mr MAX @AlFeG 3 @AlFeG 3bro use v3 in admin panel and then update manually to v5 from provided update files in sql and php side. And use v5 Android code and link v3 updated admin panel with v5 and make sure to use php version 7.4 its not working in newer php versions. If any doubt, need help contact me on insta I'll guide you to setup and run this project completely. My project is running with no error. Here: https://instagram.com/l_i_p_a_n_