Samsung 300k Tool Error 995

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While trying to upgrade my Claro galaxy s7 edge from android 6.0 to 7.0 using Smart Switch my phone crashed and the software got corrupted. (couldn't do it through manual/automatic update). Now i'm stuck on the Window: 'An error has occurred while updating the device software. Use the emergency recovery function in the Smart Switch PC software'. I tried both the emergency Software Recovery and Device Initialization but both failed with error 'failed to run firmware upgrade unknown error occurred'. Tried it in different computer, restarting both the devices, reinstalling device driver. Socks design software free programs.

Finally i searched forums and tried to flash custom rom using ODIN. Thing is while downloading the ROM my phone went to Download mode when i pressed 'Volume up' + Power + Home button but now the combination just does nothing and i'm stuck on the 'An error has occured window'. I tried 300k tool and also Both volume + power + slide in usb cable combo but nth happened. I tried to install custom rom through ODIN while in this window but ti fails after 2 mins too. Also Pressing Volume down Power and home (recovery mode) brings me to this same window again and again. Just waiting for the battery to die and start anew.

Just 4 days with my phone. Any help to solve these problem are appreciated. I am having the same issue after trying to flash updated ROM on my S8 via Odin. Process got to the end and said 'FAIL'.

Samsung_300K_Tool_Error_995_JWWJ75.exeBT种子创建于2018-04-06 23:43:10，文件总大小391.64 KB，共包含1个文件，被下载201次，下载速度极快，Btbit提供Samsung_300K_Tool_Error_995_JWWJ75.exe的磁力链接下载与迅雷链接下载。.

Following the reboot, I was stuck on the 'An error has occurred.' Screen and every attempt to enter Download mode or recovery mode (By quickly switching to the volume up button in between reboots, as you stated) has failed. Smart Switch is not recognising my device either despite all the correct Samsung USB drivers being installed.

Any ideas anyone? Apologies for posting here on S7 forum but the problem is identical.