Dear Mr Riddhi,
The way you are conducting this support claim is utterly scandalous. If you know what the problem is, please urge your technical team to sort it out or let me know where it lies.
Needless to say you are doing untold damage to your brand name by delaying a suitable answer which adds on the loss of confidence in your product by the unmitigated disaster this upgrade has proved to be.
Please act and act now. Thanks,
V Miro