F2FS How to..?

How can i format my phone with f2fs fylesystem?
No such an option in twrp

I want to... Sprint - SM-N915P (4.4.4) Note Edge

Hi, I have a Sprint Note Edge running Android 4.4.4 and I have previously rooted it in the past.
However, I'm not 100% sure what I did to root it as I did this back in February and I have since to do
anything else root related since then.
Model number is SM-N915P.
I have root currently, and its running android 4.4.4

I want to, if possible, update to 5.1. And I want to make sure I still have root.
Can someone kind of guide me along? Its been a while and I'm not sure where to start.
Links to threads/etc would be appreciated.
Much thanks in advance.

Upgrading from Note 4 to.... Note 4

Never thought I'd make this upgrade.... My Verizon Note 4 is being traded in for a ... T-Mobile Note 4.

10 years and 5 lines on Verizon. I don't see a phone I can actually upgrade to from the Note 4- so it makes sense to get a rootable, rom-able Note 4. I'd be perfectly happy with that. I don't think that trade is for everybody, but I see nothing coming in 2015 that's any advancement I want to live with.

Just to let you know how it turned out moving out of my Verizon Note 4 and taking my family with me (I think that's relevant for this forum- mods, if it's not, you can delete my post), here's how it worked (unlimited talk and text):

Traded my VZW Note 4 (6 gigs data Plan) --------> TMO New Note 4 (10 gigs).
Porting over a VZW Note 3, 2 gig plan -------->10 gig plan
Trading a Note 2 in for a New Note 3, unlimited data --> 10 gigs
Changing one flip phone to Galaxy core Prime -----------10 gigs
Porting over one flip phone -----------no data

VZW: 233/month. T-Mobile: 168/Month. Fortunately, In my area Tmobile actually has better data/voice coverage than VZW.

I think I'll take the extra dollars and get a nice big battery. I have no problem living with that for a year or two.

my s6 edge IMEI is blacklisted now, is there anything i can do myself or take it to..

hey guys, before i rooted my phone i messed it up and lost my imei and was stuck in a boot screen, i took it to a shop 30 mins from me and they charge me and they added a imei on my phone, the phone as been working for more than a month and it stop working yesterday and i check the imei on the tmobile site and it says it was blocked and no network would work under it. is i dont have a backup of the original imei but i have the box with the imei written on it, is there anything i can do, if not then i would just take it to the shop again and have them add a imei to it, let me know guys thanks!