Yes..it can be done tho am not sure whether the technician wanna do that for every case.
My previous S4 twice softbricked and need to be reflash.

First case my SELinux still permissive so no Knox..but the status clearly show custom with binary count 2. The phone reflashed without issue.

Second case..same thing but this time my SELinux already enforcing and my Knox got triggered with the failed flash. Again the phone reflashed without issue and thus time it came back with the oldest firmware (MEA I think) that have SELinux status permissive without any Knox in download mode.

You will only waste you time and get tons of headache if you try to downgrade your firmware to MJ1. It won't work but you can still downgrade to MJ6 firmware if you want to.

How much and how fast your battery drain..?
Install Betterbatterstats app and Wakelocks detector app then monitor it. See what apps or system that cause the excessive drains

And don't update the HK MK1 firmware also...you'll end up with no CSC and keyboard not working...lolz

Can...but you'll end up with no sound and no data connection.

But this is from Knox already triggered to 0x1.
The result might be different if your Knox still 0x0.....why not you try if your Knox still not triggered yet.

Go ahead then...first flashing I stuck at bootloop.
I go into download mode and reflash again...it got stuck at boot logo.
This time I went into recovery and do factory reset. Phone came out okay but got no sound and no data connection.

Try factory reset first...if problem still occurred even without any downloaded apps...then go to service centre for more thoroughly checkup.

Yeah..me also doesn't like technician open up the phone..lolz
That's why I suggest you do a factory reset first...rather than living in a frequent hang and freeze situation.

One question here..anybody use Glass SP together with Otter Commuter casing here..? Does the casing fit nicely...since the Commuter have lips on the screen..right..?

Huhh..you think it will fit nicely with SGP Glass tR bro..?
Was thinking of buying both tomorrow. Since Knox'ed already then need to use the phone long term...atleast till warranty period lapse then only can sell...lolz

Have to bro..nobody wanna buy a Knox'ed 0x1 phone

Okay bro...thanks.
will take a look ait it tomorrow

I offer RM650 to anybody who wanna sell their Knox'ed 0x1 Note3

Huhh..these Chinese..Hong Kong and Taiwan firmware all problematic one. Just waste time and quota oni

Huhh..what inside ext4...last I remember the MK1 stuck when flashing cache. Need to factory reset...lolz
Want to be working again need to reflash back MJ6/MJ7.

Ya...left 14GB oni now...if download this one then left 12GB

Ya..ya..later tonite I try but at dawn much better connection. Can download faster.

Me Odin totally failed...get BIG red fail...lolz.
Atleast with MOP can still flash but no csc.

Why I have a feeling am just gonna waste my quota for nothing
Later if stuck need to factory reset again...sighh

Bahh..cheeky you. If already have the firmware edi then go ahead flash lar bro.
Do Nandroid first..then flash the MK2. If problem..flash back full stock MJ7..root it with CF-Autoroot..install TWRP and restore Nandroid.

Oo..is it the screen show phone and PC then ask you to use Kies Recovery one..?

I got that one time but I just pull out the usb cable..take out the battery...put it back and go into download mode. Then reflash back MJ7...all kautim but not root lar ehehe