Can I change my laptop processor from i3 to i7?

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dont look at the motherboard section!

look at the cpu section -> for example: socket 1023 fcbga

like raymondo70 says take a look to the mainboard-manufacturer and read the manual - perhaps there is an list with possible cpus for an upgrade

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//www.intel.com/content/www/us/en/support/articles/000005682/processors.html

Intel Desktop Processor Upgade Information

If you would like to upgrade your processor to a new generation Intel® Core, compare Celeron® or Pentium® processors, or compare different processor families, you can watch the videoFinding Information on Intel Processors or review the steps inHow to Compare Intel® Processors Using Product Specifications Page [ARK].

Contact your system or motherboard manufacturer before upgrading your desktop processor. Your manufacturer is familiar with your system specifications and the different upgrade options available, and they can tell you which processors your system or motherboard supports.

Even if your processor and motherboard socket match, it's critical to make sure that your motherboard BIOS supports your new processor. Older motherboards frequently don'thave BIOS support for newer processors. Lack of BIOS support for your processor can cause the system to not boot or display erratic behavior.

Another upgrade consideration is that faster processors, and processors with more cores, can also affect the temperature of your system. You need to make sure your chassis and thermal solution work with your upgrade from a thermal perspective.

One way to verify processor compatibility is to use the Intel® Desktop Compatibility Tool and search by processors or motherboards.

For more information on your Intel® Processor or Intel® Desktop Board, select one of the links below:

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the same class, processor heat, bios support, power supply...

for example:

[mobile 5th generation]

i3-5020U - 2 cores - 2,2 GHz basespeed, 3MB Cache with 15 Watt TDP down to 10 Watt

i5-5300U - 2 cores - 2,3 GHz basespeed, 3MB Cache with 15 Watt TDP down to 7,5 Watt

[mobile 8th generation]

i3-8130U - 2 cores - 2,2 GHz basespeed, 4MB Cache with 15 Watt TDP down to 10 Watt

i5-8279U - 4 cores - 2,4 GHz basespeed, 6MB Cache with 28 Watt TDP

i5-8269U - 4 cores - 2,6 GHz basespeed, 6MB Cache with 28 Watt TDP down to 20 Watt

or i7-8550U - 4 cores - 1,8 GHz basespeed, 8MB Cache with 25 Watt TDP down to 10 Watt

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You need to check whether the CPU sockets of I5 and I7 match your current motherboard.