[Samsung Galaxy A50 Questions & Answers] L!V3_4_XC3SS:
So thanks for the updating of your ROM and Device specs, and that shed the light necessary for me to understand where we are at with your device...

So the reason this has happened is because this was an originally carrier locked - model U with only a specific carrier's ROM prob the Xfinity CCT - that's the only thing it could give you as far as a CSC which is why SamKey didn't get it done for you. I'll be happy to give you another SamKey code but you won't need it - and I'll also give you a different corrected code for entry intp the menus for the second methodology I spoke about as well...

To fix this situation you'll need:

A copy of the Raymond patch version of Odin which is 3.14.1 3B Patched you can search or here's one place -- https://odindownload.club/odin-3-14-1-patched-modded-for-windows/

It needs to be patched even though you're flashing stock FW because you're going to crossflash a U device to a U1 rom which is fine 'cus it's the same hardware but full official Odin still wouldnt' allow it. This will allow you to flash a rom to your device with the XAA CSC which the multi rom... it supports myriad US carriers including the one you want. VZW...

Remember that you're going to want to backup important data before you execute this procedure - you always want to use the full CSC file in the relevant Odin slot when you change a device's ROM not the HOME_CSC (you can get away with it if you're changing CSC on same rom) because you need a wipe to ensure the best possible flash on your device - don't dirty flash the U1 ROM in an attempt to avoid backup & keep your data it will bring problems down the road.

Take out your sim before flashing the new rom

Flash your SM-A505u device with the orginal CCT CSC to a u1 (originally unlocked) device with the XAA CSC as follows:

Download the latest XAA rom for the sm-A505U1 device

here's one place that usually does a decent speed download:

https://samfw.com/firmware/SM-A505U1 then go choose XAA in the CSC box,

If you did it today this would be the latest ROM https://samfw.com/firmware/SM-A505U1/XAA/A505U1UESCCUD2

I usually recommend the latest unless you have some reason you don't want to increment your bootloader or etc. not usually relevant.

You have the patched ODIN from above, already, so now you DL the latest rom for the U1 device with the XAA CSC (American Multi-rom has a bunch of US CSC's

Extract the ODIN, unzip the Rom zip file into its parts - run the ODIN find the unzipped roms pieces and put them where they go -- except home_csc won't need that one this time. Reboot phone into download/odin mode adb reboot download at the adb prompt ought to do it 4u, and then when it comes up you can flash the rom... as i stated above

After a successful flash/reboot change CSC to VZW by rebooting after you insert the sim card of your preferred network and then it should change you over to the new CSC appropriately. In your case VZW (Verizon) should be on point.

If for some reason it doesn't, I'll give you another samkey credit or you can go for the 2nd method you won't need any credits - enter the service mode by

*#*#197328640#*#* instead of my first code and let's see where that gets us...

You could use this same situation for an international A50 device but you'd have to sub the correct ROM for your region..

Sorry this one was a little convoluted but we'll get there... Maybe I'll come back and clean it when it works for you so it will be more useful to others.

L4XS