Still, you can compile + decompile the code you have, and compare that to decompiled production app. This might allow you to apply any cganges back to the code.

Still, you can compile + decompile the code you have, and compare that to decompiled production app. This might allow you to apply any cganges back to the code. Btw, it's not a dev who lost the code, it's the company and inadequate development process. It should never have been the single dev's responsibility to make backups.