Thinkpad 13 2gen, is it possible to upgrade a non-linear cpu?

Question

laptops

Good day. There is an irresistible desire to upgrade your working machine for several years to come. The most incomprehensible thing is whether it is possible to upgrade a bga processor to any other one?
Details:
- We have a laptop -- thinkpad 13 2gen with 7100u processor.
- The maximum processor in this line is 7500u.
I would like to put: 7600u or 7660u.
We fit into the heat pack - 15 TDP.
Socket -- BGA1356 for all Kaby lake-U processors.
The northbridge (it's a chipset, if I'm not mistaken) is located on the same substrate as the processor, so I suppose there will be no incompatibility because of this.
They say that the BIOS may not support the processor, but you can reflash it, right?
Actually, how to understand that after soldering the processor will start? What does a processor actually need to start up? I will consider any information, links, advice useful, so I beg you to answer :)
If you cannot replace the processor with one that is not from the line, can it be replaced with a "line 7500u"?
Links to processors:
7100u (current) -- https://ark.intel.com/en/products/95442/Intel-Core...
7500u (maximum of the line) -- https://ark.intel.com/ en/products/95451/Intel-Core...
7600u -- https://ark.intel.com/products/97466/Intel-Core-i7...
7660u -- https://ark.intel.com/ products/97537/Intel-Core-i7...

Answer 1

Intel processors of the same series differ only in configuration. If Core i3 is supported by the system, then Core i7 will be. The microcode in the BIOS is the same for them. Yes, and at the factory, the crystals are initially identical.
Replacing the processor is possible, albeit time consuming. It is difficult to do this on your own (at home, on a spotlight or on an electric stove without temperature control, it is easy to overheat the board). The only question is whether there is any sense in these gestures? A TDP of 15W means that the processor will deliberately slow down its performance (even when not overheating) and the Core i7 will perform approximately on par with the Core i3.