Crossflashing Huawei B593s-22 from Sonera to Elisa firmware

My B593s had ancient Sonera branded firmware that has DNS issues when IPv6 is active. At least IPv6 reverse queries stall causing long delays. There's some rumors going that Sonera provides updated firmware over-the-air, but I couldn't trigger update despite trying hard. Might be because I was using Elisa SIM card. Since Elisa does have fairly recent firmware available for download I thought why not use Elisa firmware instead - get IPv6 bug fixed, have correct operator settings as default and also future updates should work without extra hacks.

Making Intel 910 PCIe SSD bootable

Recently market has been flooded with 400GB and 800GB versions of Intel 910 Enterprise PCIe SSD priced just one tenth of original cost. Downside of this device is its inability to boot requiring separate SSD for system files and software RAID0 support from OS. Both obvious downsides for my intended use with ESXi.