1. Open Telegram > Settings > Privacy and Security
2. Two-Step Verification > Set Password
3. Enter a new password:
Enter password: [password] ->
Re-enter password: [password] ->
4. Password Hint:
Hint: [hint] ->
Success!: OK
5. Enter "Recovery Email"
6. Enter "Verification Code" sent to recovery email > Return to Settings
7. Open Telegram > Settings > Devices
8. Tap on "unknown" device name > Terminate Session
9. Repeat for all "Unknown devices"