On this page, You can find LG K40 LMX420MM Stock ROM/Firmware – LG K40 metro by T-mobile ROM collections.
IMEI:3599621004xxxxx
Device: LG K40
Model: LMX420MM, LM-X420MM, X420MM
Model Suffix: AMTPOP
Buyer Suffux:MTP
Carrier: Metro by T-mobile
X420MM10O
X420MM10O_00 – Android 9.x Pie
http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FWB60W19E20IABID6F4DXR5/X420MM10o_00_MPCS_US_OP_0205.kdz
X420MM10P
X420MM10O_00 – Android 9.x Pie
http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FW687M0AE2Z8ALIE5F0AEP4/X420MM10p_00_MPCS_US_OP_0408.kdz
X420MM10Q
X420MM10Q_00 – Android 9.x Pie
http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FW03YS4BE2VQAB0FA416CF8/X420MM10q_00_MPCS_US_OP_0619.kdz
X420MM10R
X420MM10R_00 Android 9.x Pie
http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FW34RHLCE2D1AM7CC291RAV/X420MM10r_00_MPCS_US_OP_0805.kdz
X420MM10S
X420MM10S_01 Android 9.x Pie
http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FW50TVZDE2D2AVFE4FA2NAA/X420MM10s_01_MPCS_US_OP_1031.kdz
X420MM10T
X420MM10T_00 Android 9.x Pie
http://lgegdmswdl.s.llnwi.net/dn/downloader.dev?fileKey=FW92LDSDE2YIANN14BB3ZE3/X420MM10t_00_MPCS_US_OP_1120.kdz
Please use XDM download manager to download the LG K40 Stock kdz ROM from the above Links.
and here is the LGUP TOOL for LG K40 and the latest LG USB drivers, LG Bridge for LG K40 LMX420MM for Metro by T-mobile!