Samsung S6 Edge not start (bootloop), help for a desperate girl?

hello friends, I'm italian girl, congratulations for the forum
my sister have a samsung S6 Edge (buy in the shop Tim in Italy), but suddenly it does not start regularly (infinity bootloop)
it is possible to resurrect it?
My test: (I'm a stubborn girl)
-the battery ok recharge
-recovery- reset factory ok, but not solves!
-can be accessed to Odin mode download, ok
-I could not know the original firmware, then a stroke of genius ...
I have flash the latest firmware available in samMobile[ for samsung edge s6 SM-G925F, firmware ITV (no brand..) android 7]
I used Odin 3, the procedure is successful
The log:
<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:0/005> Added!!
<ID:0/005> Odin engine v(ID:3.1301)..
<ID:0/005> File analysis..
<ID:0/005> Total Binary size: 3563 M
<ID:0/005> SetupConnection..
<ID:0/005> Initialzation..
<ID:0/005> Get PIT for mapping..
<ID:0/005> Firmware update start..
<ID:0/005> NAND Write Start!!
<ID:0/005> SingleDownload.
<ID:0/005> sboot.bin
<ID:0/005> cm.bin
<ID:0/005> boot.img
<ID:0/005> recovery.img
<ID:0/005> system.img
<ID:0/005> cache.img
<ID:0/005> hidden.img
<ID:0/005> modem.bin
<ID:0/005> RQT_CLOSE !!
<ID:0/005> RES OK !!
<ID:0/005> Removed!!
<ID:0/005> Remain Port .... 0
<OSM> All threads completed. (succeed 1 / failed 0)
<ID:0/004> Added!!
<ID:0/004> Removed!!

But after, the device ok rebot, I see android robots- installing system update - the bar loads 0% <25%<32% and immediately after there is the writing "Erasing"....rebot but again BootLoop

I tried an older firmware, but now Odin Fail (I believe it is not possible downgrade firmware, I should have started
with an older firmware...
I'm disaster girl..
someone has some advice for me, before I launch the device from the balcony?

(sorry for my language)

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