[Verizon Galaxy S 5 Android Development] jrkruse:
This Process Will Update Or Downgrade Your VZW EMMC Chipset DEV Aboot Bootloader Unlocked S5 To Marshmallow 6.0 Lollipop 5.0 Or Kitkat 4.2 or 4.4

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Root And Unlock Instructions Can Be Found Here

EMMC 15 Rooting And Bootloader Unlocking

EMMC 11 Rooting And Bootloader Updating Or Downgrading

Explanation On This Process

To update bootloaders to a newer or older bootloaders all moddified system firmware must be put back to stock in order for the bootloader to update. There is some kind of check and a flag is thrown if there is a modded boot or recovery image present. This is why it is a 2 step process and why it cannot simply be a one zip process. You are on unlocked bootloader and have TWRP probably install and maybe a custom boot.img. To upgrade bootloaders the stock recovery and boot images must be put back to stock and when you do this you obviously do not have a way to flash the zip to update rom and bootloaders. because there is no more custom recovery installed. So too do this the first zip removes TWRP and puts back Stock recovery and boot images and also adds safestrap recovery which is a system based recovery. Then when booted to safestrap recovery you can flash the rom zip with bootloader update and it will flash properly because there is no modified boot or recovery image then once the zip is flashed it removes safestrap and puts back TWRP recovery. Now the reason there is a 2 different Files To Prepair To Upgrade Or Downgrade one for kitkat and one for Lollipop/Marshmallow is the safestrap needs to be different for the kitkat system vs the lollipop/marshmallow system which can use the same safestrap. This is the reason on zip does not work for all 3 systems

Download Files To Prepair To Upgrade Or Downgrade From Unlocked KitKat 4.2 or 4.4 Bootloader Rev1-Use To Update To Rev2

EMMC_15_TWRP_KK_Prepare_Dev_BL_Update.zip

This File Is Only For People Still On Rev1 Bootloaders

Download Files To Prepair To Upgrade Or Downgrade From Unlocked KK LL MM All Bootloader Rev2

EMMC_15_TWRP_Prepare_Dev_BL_UP_Dwngrd.zip

This File Is Only For People On Rev2 Bootloaders

Download Rom Files

EMMC_15_SS_Install_QL1_6_0_1_MM_Bootloader_Unlock_AIO_Rom.zip

Stock QL1 Deodexed Rom Prerooted With EFTSU with root hide Debloated And DeKnoxed

EMMC_15_SS_Install_PB1_5_0_1_LL_Bootloader_Unlock_AIO_Rom.zip

Stock PB1 Deodexed Rom Prerooted with SuperSU 2.82 Debloated And Deknoxed

If you wish to use magisk on this rom you can download the View attachment 4888293 and flash when this entire process is done. If you wish to use newer magisk zips you will need to manually patch your boot.img but the View attachment 4888293 will do it for you when you flash it

EMMC_15_SS_Install_NK2_4_4_4_KK_Bootloader_Unlock_AIO_Rom.zip

Stock NK2 Deodexed Rom Prerooted with SuperSU 2.82 Debloated And Deknoxed

Instructions

You Must Be On VZW EMMC Chipset 15 With DEV Aboot Unlocked Bootloader With TWRP Recovery

1. Choose the file from the Download Files To Prepair To Upgrade Or Downgrade above that matches your current firmware and place on phone

2. Choose rom from Download Rom Files that you wish to upgrade or downgrade too and copy to phone

3. Reboot too TWRP recovery and choose install and choose EMMC_15_TWRP_**_Prepare_Dev_BL_UP_Dwngrd.zip and install. Do not wipe anything at this point just flash. This zip will remove TWRP recovery and replace any it and your boot image with stock boot images and install safestrap to your system which is needed to upgrade or downgrade bootloaders. When down flashing phone will reboot phone to Safestrap Recovery which looks just like TWRP recovery.

4. In Safestrap recovery choose install and choose the EMMC_15_SS_Install_***_*_*_*_**_Bootloader_Unlock_AIO_Rom.zip you copied to your phone. This zip will install proper bootloaders and firmware and rom and TWRP again. Do Not wipe anything at this point just flash the zip. Once zip is finished flashing phone will power off.

5. Now reboot phone to TWRP recovery which will now be back on your phone and goto wipe and choose advanced wipe and wipe data only. Then reboot phone and you are done

Bugs Problems And Tips

All roms are deodexed so they will take a long time to boot up to 20 minutes or maybe longer the first time or if you wipe dalvik cache or data

When Rom is booting up if your key lights come on and stay on why the rom is on bootanimation the entire time and waiting for rom to boot then this means your bootloader is not matched to firmware. I suggest trying above process

Fingerprint will not work on kitkat roms and may not work on others

All above roms use the QL1 baseband you are free to use any baseband you want however the Non-Hlos file must match firmware so only flash modem file

If you flash modded boot images it may break root

If you loose bootloader unlock or wish too start fresh go here first https://xdaforums.com/verizon-galaxy-s5/development/vzw-emmc-15-chipset-onlyroot-bootloader-t4009089

If simply wanting to reflash an above rom zip over same rom and firmware it is ok too just flash it in TWRP you can skip the EMMC_15_TWRP_**_Prepare_Dev_BL_UP_Dwngrd.zip

All above methods are for Samsung Stock roms I do not offer support or answer questions about flashing Lineage or AOSP based roms