The update likely changed your wireless channel settings back to "Auto," causing your router to sit on a congested channel. Log back into the interface, navigate to the Wireless settings, and manually select a clean, non-overlapping channel for both the 2.4 GHz and 5 GHz bands. To ensure your specific update goes smoothly, let me know:
Have you tried the latest DSL-3788 firmware? Did it fix your WiFi drops? Drop a comment below or check out our Router Settings Cheat Sheet. dsl-3788 firmware
: Ensure the power adapter is firmly attached to both the wall and the router. Interrupting the power while updating will ruin the device. The update likely changed your wireless channel settings