[T-Mobile Galaxy Note 4 Q&A, Help & Troubleshooting] scragnothh:
Note Edge SM-N915FY, same issue

Since the Note 4 and Edge are mighty similar, and since I suffered from the same error since October 2017 on a used-bought SM-N915FY (bought it in December 2016 for the then-low price of 160 €) I wanted to try the tutorial by [MENTION=1105890]mtran1977[/MENTION]

But I waited to long (so I thought), because two weeks ago it didn't reboot, in fact did nothing at all, even after leaving it cold longer than ever before (with pen, SIM and battery removed of course). Before this I lived with the flaw nearly four months, it was annoying but I didn't have the money for a new phone and the upgrade path is complicated (Note 5 not officially available in Europe so they are kinda rare on the used market, Note 7 unfortunately only for collectors and enthusiasts - I need a phone which just works, Note 8 too new and therefore to expensive), but I don't have another choice but the Note line because I love the S-Pen feature.

I got mine back to life from the bricked state by following this small tutorial: https://xdaforums.com/showpost.php?p=69194863&postcount=14 (re-installing bootloader from SD-card) to be able to recover my data.

After that I wanted to try the tutorial from this thread - I spent the better part of yesterday on it. Most of the time it didn't even start in Odin, gave me the Fail right away (Pit file errors, Flash read errors, etc). On other occasions it started but failed on the way through. And entering the Download mode was kinda different from try to try. Most of the time, all the text was there immediately (as it should be). Other times it was there immediately but with a "ddi: mmc_read_fail" somewhere in there - pulled the battery and started over since I learned that Odin would fail right away in this case. Rarer it would take some time to spell all the lines out, accompanied by another "ddi: mmc_read_fail" line - pulled battery.

After two separate successes flashing the FW with Odin, my phone didn't go through step 7 without locking up unfortunately. On the first try where it got this far, after I pulled the battery, it didn't want to boot into Android at all. It wanted to go into the recovery mode by itself (turning it on without the key combo) and then it showed the menu. Choosing "reboot system now" didn't help it, it wouldn't go on.

The second success in Odin was a bit more promising. It got through the recovery, but got stuck on a black screen, maybe during the attempt of rebooting after it did it's recovery thing. I saw that it was still on because I have a permanent blue line on my screen - at the edge of the curved part (it just appeared by itself some time ago). No other solution but to pull the battery again. After that, on the next power on without the key combo, it went into recovery again, did it's thing, seemed to have crashed again but I left it a while, it booed itself into Android.

Strange thing, all my data was sill there. Would have thought that it got wiped, since step 8 clearly states that you should have an Android that behaves like it was launched for the first time.

After successful Odin attempt one I also tried this: https://xdaforums.com/showpost.php?p=71757019&postcount=27

Flashed TWRP 3.2.1 gave me the senandroid error, I tried TWRP 3.1.0, worked better. Followed all the steps, finally rebooted directly into Download mode as told, but there was the dreaded "ddi: mmc_read_fail" again. Didn't try further on this route.

What I can confirm is that it works better when the phone is cold. Yesterday I tried every 15-20 minutes while watching YouTube after each fail. The second successful Odin flash was today in the morning, after the phone lay cold for the night.

Conclusion: I bought myself a Note 5, gave up on the Note Edge. Was able to source the SM-N920C which supports the in Germany essential LTE band 20 for 230 €. Don't like that the Note Edge didn't last longer, but what should you do... Another mainboard will certainly die the same way sooner or later, and it's a considerable chunk of change (you don't get them for free or dirt cheap). Even another Note Edge with battered screen might have other faults you don't know about when you buy it. I just don't want all the hassle anymore, just a phone with S-Pen which I can rely on. I also heard about Wacom's bluetooth enabled smart pen - neat idea I must say - but it still wouldn't have the convenience of just pulling the S-Pen out of the locked phone and immediately take a quick note. Just having the pen separately kills the convenience for me, and at I think 60 $ it isn't really cheap either.

The missing SD card slot and non-removable battery bugs me a bit (the battery more than the SD-card - for music playback on the go I use another device anyway and 32 GB is still plenty for photos and the handful of apps I use) - don't like it that Samsung goes the Apple-way now. And, with glass on both sides, a protective case will be mandatory.