I didn't understand what happened when you say this happened.
But in any case you don't need to go to service center. Be rest assured. I have had download failures many times. At times almost 15 times download failed but it was always due to the computer issues. After repeated attempts it always worked. Follow the stock rom recovery procedure without mistakes and be sure it will be successful.
I found one thing even if no rom and recovery is present then our mobile shows up a screen where just three options are displayed saying no system is present or something but from that state also I have recovered my phone.
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---------- Post added at 01:26 AM ---------- Previous post was at 01:20 AM ----------
Do you mean that after flashing super su you were stuck on flash screen. Then that's normal. Re root..... If still doesn't work just go to twrp then wipe only data, cache and dalvik cache. This will factory reset your rom. You don't need to re flash Complete rom.
And remember to follow step recommended in my previous post. First take twrp backup then root. So that you can recover later anytime.
If nothing works just flash recovery (twrp) using adb. Method posted on youtube link previously. It takes only few seconds. Then restore twrp backup and you are saved. It advisable that you make complete system backup on twrp.
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