[Galaxy S III Q&A, Help & Troubleshooting] noobno.NaN:
I have an i9300 bought from UAE having stock firmware and stock recovery (not rooted).

But it wont boot and is stuck on Samsung's boot image.

However when I booted up into recovery, along with the Recovery option it said it wasn't able to mount or find some volumes....

So I looked up some post and tried installing CF-Auto-Root for i9300 and later TWRP-3.0 for i9300 using Odin 3.10.7 but both failed.

And now I am stuck with only Download Mode.

I also looked up for firmware but found two different versions XSG and LYS and also for Android 4.3 (I remember having 4.1.x)

Also I tried printing the PIT using heimdall which worked as expected.

It would be great to have a backup of my files, if I could atleast mount the internal memory.

Is it possible to access the device using adb via some way in download mode?

Also is there a way I can re-flash the stock firmware? If yes, than which?

[EDIT 1] Here's my pit file

Session begun.

Downloading device's PIT file...
PIT file download successful.

Entry Count: 16
Unknown 1: 1598902083
Unknown 2: 844251476
Unknown 3: 30797
Unknown 4: 0
Unknown 5: 0
Unknown 6: 0
Unknown 7: 0
Unknown 8: 0

--- Entry #0 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 80
Attributes: 2 (STL Read-Only)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 0
Partition Block Count: 1734
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: BOOTLOADER
Flash Filename: sboot.bin
FOTA Filename:

--- Entry #1 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 81
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 1734
Partition Block Count: 312
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: TZSW
Flash Filename: tz.img
FOTA Filename:

--- Entry #2 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 70
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 34
Partition Block Count: 16
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: PIT
Flash Filename: mx.pit
FOTA Filename:

--- Entry #3 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 71
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 50
Partition Block Count: 2048
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: MD5HDR
Flash Filename: md5.img
FOTA Filename:

--- Entry #4 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 1
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 8192
Partition Block Count: 8192
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: BOTA0
Flash Filename: -
FOTA Filename:

--- Entry #5 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 2
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 16384
Partition Block Count: 8192
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: BOTA1
Flash Filename: -
FOTA Filename:

--- Entry #6 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 3
Attributes: 5 (Read/Write)
Update Attributes: 5 (FOTA)
Partition Block Size/Offset: 24576
Partition Block Count: 40960
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: EFS
Flash Filename: efs.img
FOTA Filename:

--- Entry #7 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 4
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 65536
Partition Block Count: 16384
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: PARAM
Flash Filename: param.bin
FOTA Filename:

--- Entry #8 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 5
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 81920
Partition Block Count: 16384
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: BOOT
Flash Filename: boot.img
FOTA Filename:

--- Entry #9 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 6
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 98304
Partition Block Count: 16384
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: RECOVERY
Flash Filename: recovery.img
FOTA Filename:

--- Entry #10 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 7
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 114688
Partition Block Count: 65536
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: RADIO
Flash Filename: modem.bin
FOTA Filename:

--- Entry #11 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 8
Attributes: 5 (Read/Write)
Update Attributes: 5 (FOTA)
Partition Block Size/Offset: 180224
Partition Block Count: 2097152
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: CACHE
Flash Filename: cache.img
FOTA Filename:

--- Entry #12 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 9
Attributes: 5 (Read/Write)
Update Attributes: 5 (FOTA)
Partition Block Size/Offset: 2277376
Partition Block Count: 3145728
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: SYSTEM
Flash Filename: system.img
FOTA Filename:

--- Entry #13 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 10
Attributes: 5 (Read/Write)
Update Attributes: 5 (FOTA)
Partition Block Size/Offset: 5423104
Partition Block Count: 1146880
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: HIDDEN
Flash Filename: hidden.img
FOTA Filename:

--- Entry #14 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 11
Attributes: 5 (Read/Write)
Update Attributes: 1 (FOTA)
Partition Block Size/Offset: 6569984
Partition Block Count: 16384
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: OTA
Flash Filename: -
FOTA Filename:

--- Entry #15 ---
Binary Type: 0 (AP)
Device Type: 2 (MMC)
Identifier: 12
Attributes: 5 (Read/Write)
Update Attributes: 5 (FOTA)
Partition Block Size/Offset: 6586368
Partition Block Count: 0
File Offset (Obsolete): 0
File Size (Obsolete): 0
Partition Name: USERDATA
Flash Filename: userdata.img
FOTA Filename: remained

Ending session...
Rebooting device...
Releasing device interface...

And when I try to flash recovery I get this:

$heimdall flash --RECOVERY recovery.img
Heimdall v1.4.1

Copyright (c) 2010-2014 Benjamin Dobell, Glass Echidna
http://www.glassechidna.com.au/

This software is provided free of charge. Copying and redistribution is
encouraged.

If you appreciate this software and you would like to support future
development please consider donating:
http://www.glassechidna.com.au/donate/

Initialising connection...
Detecting device...
Claiming interface...
Setting up interface...

Initialising protocol...
Protocol initialisation successful.

Beginning session...

Some devices may take up to 2 minutes to respond.
Please be patient!

Session begun.

Downloading device's PIT file...
PIT file download successful.

Uploading RECOVERY
100%
ERROR: Failed to confirm end of file transfer sequence!
ERROR: RECOVERY upload failed!

Ending session...
ERROR: Failed to send end session packet!
Releasing device interface...