upgrade CPU on a predator G3 - 710 when put Motherboard it wont turn on, need to update BIOS?

Also it's worth saying there will be very little change in performance between the two CPUs… We don't typically recommend a CPU change until all other avenues have been dealt with. SSD upgrade first, memory upgrade second, GPU upgrade third and CPU upgrade about sixteenth.

You must be flashing the bios wrongly (follow the WIN PDF in the bios Appendix folder) as you should be flashing the bios with the last G3-710 desktops bios version R02-B2 not the version RO2-A2. Try that and see if the last bios version flashes as it should do 100%, as the "SOPHIAB MB_B150_USB3.0_WIN10_HDMI_DP" mobo is compatible with these cpu's:

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

Then either the i7-7700 cpu that you bought is faulty or the mainboard is faulty as the above G3-710 desktop B150 chipset mobo works with all the above cpu;s that the Acer G3-710 desktop has and the bios versions provided by Acer. Have a technician check the mobo out if the cpu is not faulty. Good luck.

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

There are two different base models for your machine. The early AG3-710 and the later G3-710. The first uses a 6th gen chipset and comes with either an i5-6400 or an i7-6700. The later has a 7th gen chipset and came with either an i5-7400 or an i7-7700. You can't put the 7th gen CPUs into the 6th gen motherboard. I suspect that is what is going on here…

Yes, though be aware that a CPU change will give you very little in terms of overall system performance. It sounds like you have mostly done everything that gives a bigger boost though, and a CPU will be a lot less expensive than a new machine, which is where you would see real improvement.