The B250 motherboard cannot be older than 12gen U. B250 motherboard does not support 12 generation core processor, need to match Intel 6 generation motherboard, high-end is Z690, low-end is h670, b660, h610. The B250 motherboard supports up to 7 generations of core, that is, it can not be upgraded to i7-7700k, the motherboard power supply of the whole machine is generally only enough for the current u, and the power margin is relatively small, so the upgrade is not meaningful.
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If you need more information, you can consult the relevant computer technician.
No, the B250 motherboard only supports 7th and 8th generation Intel Core processors. Even after the BIOS upgrade, 12th-generation Intel Core processors are still not supported. If you want to use a 12th-generation CPU, you need to replace the motherboard that supports that generation of CPU.