I've seen people had success without desoldering. I am sure I ve seen it here. Some 3565 spi flasher but usb only? I cant desolder 
Unpower disconnecting both ends of power adapter and wait 1h for caps to discharge
Okay but i remember people connecting to some flash pins, while powered off. And it works for them. Not serial. This ch3565 something or so??
What are you trying to do?
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CH341A, yes it works but not for all chips.
You can get them at Amazon or really cheap from Aliexpress.
Trying to flash the flash chip without desoldering it. Me suck at electronics.
Practice makes master - i challenge You to upgrade Your's skills!
This has been discussed a number of times before. The main problem is that you cannot power the flash chip without powering other chips on the board. You must figure out a way to do that safely. Meaning that you
- provide enough power,
- don't fry any IO pins, and
- keep the SoC from running and accessing the flash
I suggest reading what pepe2k says in this thread before connecting anything:
https://forum.archive.openwrt.org/viewtopic.php?id=65049
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