Crucial CT525MX300 won't boot or mount

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Crucial CT525MX300 won't boot or mount

I had Crucial CT525MX300 as my startup disk on my mac mini, and was using my old sata disk as a second hd. However after a reboot yesterday the SSD wont boot up and went into recovery mode. I tried First Aid from Disk Utility but it was failing with Exit Code 8. Then I installed OS via internet on the old sata disk and boot up mac mini from it. But still cant make my SSD mount or repair with First Aid and it shows 0 available space. I have important data on it, please advise how can I fix it. Please see snapshots below:

 

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