Pool not working after HDD crash

@skeal wrote:

One of my 4 device raid5 pool crashed by hardware and isn't even recognised in bios anymore.

So i removed the entry from the disk-screen in the web-ui.
But the pool doesn't "start" or mount. Here is some output:

[root@vm-nas videos]# btrfs fi show
Label: 'rockstor_rockstor' uuid: c1ebf744-1014-4ec6-9ba7-691ff20897ad
Total devices 1 FS bytes used 1.75GiB
devid 1 size 13.91GiB used 5.04GiB path /dev/sda3

warning, device 3 is missing
checksum verify failed on 207500640256 found 0F5FF06C wanted 0BD2F649
checksum verify failed on 207500640256 found 0F5FF06C wanted 0BD2F649
bytenr mismatch, want=207500640256, have=9210045573432974129
ERROR: cannot read chunk root
Label: 'storage' uuid: 0af818cf-40ea-4770-b396-e041369b094d
Total devices 4 FS bytes used 895.86GiB
devid 1 size 1.82TiB used 310.38GiB path /dev/sdb
devid 2 size 1.82TiB used 310.38GiB path /dev/sdc
devid 4 size 1.82TiB used 310.38GiB path /dev/sdd
*** Some devices missing

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So devid 3 is missing. But how to remove it and start the raid up again? Or is there no chance and my data is gone?
3 of the 4 devices are still working as expected...

sda = boot device (not part of "storage" pool)
sdb-sde = storage pool ... one of them is now in hardware heaven

one try:
btrfs device delete missing /mnt2/bilder/ results in:
ERROR: error removing device 'missing': no missing devices found to remove

Please help as there are some important files there (Yeah i know backup ... but it's some days old)

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