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S4 (GT-I9505 [LTE?]) stuck in reboot loop, and recovery "Sys

My S4 wanted to install an update: before letting it proceed I thought it would be good to backup - however after/during backup (Kies 3/Smart Switch on Windows 10) something happened, and now it fails to boot fully - just ends up on a constant boot cycle, almost as if the system update was run but corrupted.:

Boot (Cycle)
==========
1. get the Samsung splash screen with the model number, followed, eventually with 
2. the Samsung colourful graphics "fireworks" which stop, and then the phone Vibrates/buzzes twice, and then restarts, 
3. GOTO '1' - repeating itself continuously.
https://youtu.be/wcsF5x1R9mE

Recovery Mode
=============
Manage to get a recovery logo by using Power+VolUp+Home, and releasing power at logo. When I do this the device goes straight into a "installing system update" with Droid wiggling ears, then appears to crash out of that with "no command" and comatose Droid animation and return to the familiar faulty boot/cycling behaviour.
https://www.youtube.com/watch?v=xDUdKdUhE2E

When I was backing up, Kies had reported, 
Current version: PDA:OJ2 / PHONE:OJ2 / csc:0J1 (BTU)
Latest version: PDA:PK2 / PHONE:PK2 / csc:PK1 (BTU)
Size: 1458 MB

Don't seem to be able to do much else (hard reset or wipe cache). I think I can get into download mode - Someone suggested using Odin or Kies to re-flash the device with stock firmware, which sounds about right.

Please help.

Wenger786

Network unlocked phone - sim on monthly with Three / Hutchinson network UK.

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All Answers

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Answer
As to Odin and such

In reply to: S4 (GT-I9505 [LTE?]) stuck in reboot loop, and recovery "Sys

Find the forums that was published at and you find the "How to use Odin" pages. I don't get into that here since it's done at their site and well done too,

My answer is to ask the carrier to reflash the phone.

Collapse -
Flash with odin failed

In reply to: As to Odin and such

Odin Reports:
<ID:0/009> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/009> Odin engine v(ID:3.1203)..
<ID:0/009> File analysis..
<ID:0/009> SetupConnection..
<ID:0/009> Initialzation..
<ID:0/009> Get PIT for mapping..
<ID:0/009> Firmware update start..
<ID:0/009> SingleDownload.
<ID:0/009> aboot.mbn
<ID:0/009> FAIL!
<ID:0/009>
<ID:0/009> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

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