Flashing ROM based on lower firmware version - T-Mobile Samsung Galaxy Note5

I have the latest DPH2 firmware recently released.
Suppose I want to flash a custom rom Based on previous firmware e.g. DPG1, Can I flash it through TWRP or do I have to be on the same firmware (i.e. downgrade first)?
Same question for the Kernel base as well.

Related

Does firmware include ROM?

Do I need to flash stock ROM after flashing firmware or is it included in the firmware?

[Q] Move from LolliGPE to stock 5.0.1(rooted)?

I'd like to move from LolliGPE to the new stock verizon 5.0.1 rom and firmware. Is there anything I need to watch out for or any particular order? I'm currently still on the 4.4.4 firmware. Thanks
You should probably flash the firmware and radios before you flash any Lollipop Sense ROM

question about firmware

Im coming from an HTC device where flashing roms and flashing firmware were actually two seperate things due to security.
I was wondering that when you get a custom recovery on the LG G3, and flash a rom, do you have to also update your firmware as you go? Or does the firmware flash alongside the roms?
thanks
If you are referring to bootloaders and radios as firmware, then the rule regarding matching up the ROM to the radio applies as far as stock based ROMs go.

Firmware question

Now if there is an exploit that can flash a prior kernel can it also flash a prior firmware by chance?

About "Rom firmware required"

So, this might be a total noob question, but I want to install miui port for my sm-g360h,it says that the "ROM firmware required is stock 4.4 KK" , but I've a lineage 14.1 N installed, will that be a problem?
Also one more thing, is there a difference between "port" and "ROM" ?
20Holmes20 said:
So, this might be a total noob question, but I want to install miui port for my sm-g360h,it says that the "ROM firmware required is stock 4.4 KK" , but I've a lineage 14.1 N installed, will that be a problem?
Also one more thing, is there a difference between "port" and "ROM" ?
Click to expand...
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They are referring to the stock firmware that is still on the device(i.e. modem, bootloader, etc..)
You have LOS 14.1 installed, but that is only the system partition. When you flash a custom ROM, it only flashes the system.img to replace the stock system.img, all of the other parts of your stock firmware are still there "under" the custom ROM.
In your case, the firmware that you have is everything that you had when it was stock, before you flashed a custom ROM. Do you know what stock firmware version you had before you modified the device? If your stock firmware was older than 4.4 then you need to update the firmware to 4.4 then flash TWRP again then your ROM again.
Or, if someone has converted the necessary parts of the 4.4 firmware into a recovery flushable .zip file, you can flash that zip via TWRP then flash your custom ROM.
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