[Q] No able to root SGS3: CUSTOM BINARY DOWNLOAD: NO - Galaxy S III Q&A, Help & Troubleshooting

Hi, I bought a used SGS3. I want to root it as I have allways done with my Android phones.
After a lot of hours I spent trying to do it I find out that it could be related to: "CUSTOM BINARY DOWNLOAD: NO" message.
The facts:
- As I know the only way to root the device is using "custom binary download" mode.
- When I try to do it I read at download mode:
ODIN MODE
PRODUCT NAME: GT-I9300
CUSTOM BINARY DOWNLOAD: NO
CURRENT BINARY: Samsung Official
SYSTEM STATUS: Official
- Odin allways fails at this point and I suppose it is related to above message.
<ID:0/005> Initialzation..
<ID:0/005> Get PIT for mapping..
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)
<ID:0/005> Added!!
- As I read to increase the binary download counter I need to be root, but I am not.
Conclusion: I will never be root, change de ROM or use privileged apps like backup apps and a device like that is useless for me.
I spent a lot of time trying to solve this and I am desperate.
I will thank any hint on this. Do I have any chance to fix this, root de device and chage ROM to cyanogen or other?
Thanks,
txemi

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Do you want to root your s3 or flash custom ROMs?
Device: Samsung Galaxy S3
ROM: CyanogenMod 11 (Temasek Unofficial V24)
Kernel: Boeffla-Kernel-CM11-2.1-Beta7-

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Both. I think I cannot flash if I am not root. I would like to be able to became root first and later flash custom ROMs.

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txemitron said:
Both. I think I cannot flash if I am not root. I would like to be able to became root first and later flash custom ROMs.
Click to expand...
Click to collapse
Okay.
First go in download mode and flash the CWM (Clockworkmod Recorvery) for your s3 via Odin in Bootloader.
Device: Samsung Galaxy S3
ROM: CyanogenMod 11 (Temasek Unofficial V24)
Kernel: Boeffla-Kernel-CM11-2.1-Beta7-

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Odin usually fails with:
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

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txemitron said:
Odin usually fails with:
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)
Click to expand...
Click to collapse
did you flash cf autoroot ? does odin see the phone? while flashing you must be in download mode. it shouldnt take more than a few seconds

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txemitron said:
Odin usually fails with:
<ID:0/005> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)
Click to expand...
Click to collapse
Select file from PDA button and uncheck re-partition
GT-I9300 cihazımdan Tapatalk kullanılarak gönderildi

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After some tests with linux and analyzing dmesg and lsubs output I realised that the real problem was not a software issue, hardware usb port instead.
Being a used phone I have just bought USB cable cannot fit properly in usb port and is nearly impossible to have an usb stable connection. It is not a problem of CUSTOM BINARY DOWNLOAD, it is a problem with any thing requiring usb connection. It seems previous owner did not mind because he used the phone as is and did not use usb for data transfers.
I tryed some cables I have at home but they did not work, now I do not know what to do. I am considering next options, I do not know if there are any more.
1) Going to Samsung tech support. I am not sure if it is expensive or it does take a long time to get phone fixed.
2) Try to give the phone back to seller.
3) Spend a lot of time and going crazy testing usb cables in case some work.
4) Look for some buyer that does not mind about usb and buy another phone for me.
Thanks again for your responses,
txemi