Yealink Support. SIP-T21(P) E2. Firmware & Tool. Yealink SIP-T21(P) E2 Datasheet_V81.pdf. 2025-10-23. End-of-Sale Announcement for SIP-T21(P) E2 - Yealink
There are two primary ways to apply the file to your devices: Manual Web Interface Update: t21p-e2.bin
Address common issues like unexpected reboots or LCD display glitches. How to Perform the Update Yealink Support
Before uploading, always double-check that you are using the correct file for the "E2" version of the t21p-e2.bin