[AT&T Samsung Galaxy S 4 General] TodWulff:
Derping hard...

Taking the first paragraph literally, as I think it is intended, leaves me with the thought that the MF3/MK2 portions of guidance are lacking the steps needed to get a custom ROM installed. I am struggling with same and was hoping I could get someone more learned to help:

I am getting my arse kicked with SS v3.71 on a AT&T GS4 with MK2 firmware - when trying to install roms into a slot, it seems that the stock host rom is getting derped somehow. I've been fighting this for days and am at wit's end. FYI - Knox warr flag tripped (just in case that it matters in this context). Phone NOT encrypted.

I just did a complete reset with the full MK2 rom (all in one) via ODIN. Enabled developer and unknown sources and usb debug. Saferoot'd successfully (all the way to the end, i.e. busybox was loaded by the script and the script closed itself).

Once the stock ROM was rooted/rebooted, I installed aptoide from the extSD. Used aptoide to install quickboot, root checker, & TiBU from my aptoide repo. Used TiBU to restore root explorer from my TiBU repo on the card.

I have installed safetstrap v3.71 and then used it to install recovery. Booted into SS's recovery, and just finished backing up the stock firmware via a TWRP nandroid of the stock slot. I also did an EFS backup via EFS Pro v2.0.91 prior to the installation of the SS Recovery. After the safestrap nandroid, I went ahead and created a ROM slot, maxing out the /data partition's size to 4000M.

I'd really be appreciative if someone would be willing to hold my hand a bit, providing progressive guidance, to enable me to get a custom SS-compatible ROM installed on a ROM Slot.

I've downloaded what I believe is a SafeStrap-able ROM from here: http://xdaforums.com/showpost.php?p=45186518&postcount=1 I specifically have GPE 4.2.2 on the card. I also have the i337 ge422 build prop zip. And I have the MK2 modules zip, as reflected in the accompanying screenies. I also have put the loki-doki .zip on the card too, just in case it is needed.

All the above is pseudo documented with the screen shots shown here: https://www.dropbox.com/sh/l85rgz8l81i1cs7/12sdStsPHd/S4_Ugh?lst

What I did in the past was to change to rom-slot 1, create it, and then wipe it (system data cache dalvik) and try to install the rom. It seems that even thought I had ROMSlot1 indicated in the twrp UI that when I was doing the wiping, it was wiping the stock data and that was wiping out the stuff I had just installed on the stock (i.e. safestrap, etc. (even though when it rebooted, SS was still prompting for recovery/continue.?.)). It was mega weird.

So, in an attempt to end this maddness, I have started from scratch. As detailed above, the phone has a fresh MK2 STOCK ROM, is freshly saferoot'd, has a fresh install of SafeStrap 3.71 on it, with the SS Recovery loaded and a virgin ROM slot (1) created, with dev options enabled, unknown sources enabled, and usb debugging enabled. Is someone willing to help by providing guidance so that I 1) don't derp the freshly installed MK2 in the stock slot while installing a custom rom and 2) can get a good instantiation of GPE 4.2.2 rom installed in slot one?

I suspect that it's gotta be sumtin simple that I am borking up - maybe it is due to intracranial scarring from an unrecalled closed head injury.?. Regardless, I am mega frustrated and requesting some remedial help. Thank you, in advance.