The T-Mobile LG Stylo 2 Plus (LG K550) today received the K55010p Software Update. The LGK550BNGO1 model variant received the K55011p software Update.
According to the LG Open source website, This is still the Android 6.0 M software update which brings the January 12, 2017 security patch.
The update is available now via FOTA and LG bridge, if you want to manually install the update with LG UP, You can download the stock kdz firmware for LG K550 from below links:
Download T-mobile LG Stylo 2 Plus K550 Stock firmware
K55010p is no longer available for download from LG Server.
Model: LG K550BN Suffix: ATMOBN Download: /K55010p_00_0112.kdz
Model: LGK550BNGO1 Suffix: ATMOBNH Download: /K55011p_00_0112.kdz
Because LG has made some changes in its server settings, You can not use a browser to download the firmware from the above links. You need to use XDM download manager or other download tools to download the kdz file from LG server. Learn how to download LG firmware, Check this guide.
Remember to bookmark this page – Download LG Official Stock ROM / Firmware [U.S.] -Where you can track the software history for the Lg stylo 2 plus phone from T-mobile (K550) and MetroPCS (MS550).