HP 250 G3 Upgrading Wi-Fi adapter and Wi-Fi antenna cable (in required)

[TiimeIrre]

Hello, dear community, 

(please correct me if i have some mistakes in my knowledge and assumptions)

I have a pretty old, yet still stubbornly functional laptop, HP 250 G3 Notebook PC, the processor is Intel Core i3-4005U, the Wi-Fi adapter is Ralink RT3290 802.11bgn single-band (1 socket for Wi-Fi cable, 1 Wi-Fi cable) (both are original). 
It was bought in late 2014 and was my main computer until the recent times, I've got used to work with it, so I want to keep using it as a laptop for travels.

But (one of) the problem(s) is that it's pretty bad at catching some WI-FI connections, both 2.4 GHz and 5 GHz (with the latter it doesn't connect at all, doesn't see it in whole).

I've looked through some topics and explanations, where it was said, that bgn-adapters don't work with 5 GHz Wi-Fi connections. So I have to replace the Wi-Fi module from the laptop by the ac-type one.

AFAIL (learned), ac-type Wi-Fi adapters require dual-band Wi-Fi antenna cables (and, concordingly, have two sockets for connection with these cables on themselves). I don't know whether it is one cable with two connectors or two cables with one connector on each one (so, whether to add a cable the same as the existing one or to replace a cable with the one of another type). What I was scared of was the knowledge that Wi-Fi cables go around the LCD-screen module, so it will require to disassemble it to change the Wi-Fi cable. But my laptop is 10 y.o. already, no warranty, no support already, I guess, and I had already done several replacements of some parts (power port, RAM module, hard disk to SSD, cooler etc.), so I think I can do this replacement as well.

What I want to learn from the community is:
1) Is it possible (I'm not asking about recommended/allowed, I'm asking about factual possibility and practical effectiveness of the action) to replace bgn-type single-band Wi-FI adapter in HP 250 G3 laptop by the ac-type dual-band Wi-FI adapter (with the replacement of the Wi-FI antenna cable if required)? 
2) If yes (possible), then which Wi-FI adapter and Wi-Fi cables you would recommend me to use for a replacement? Or, at least, a source where I can look for suitable models.

If someone is going to advise me "go buy another PC" - look, I've already done it. I purposefully want to keep my HP 250 G3 as a portative PC, because it's not the first PC of mine, it's hardly sellable now, and I don't want to turn my home into a storage of old laptops (please don't tell me "go buy another flat"), especially if those laptops are stiil useable.

Thank you for your insights in advance, relying on your help and recommendations.

[banhien]

@TiimeIrre 

Your machine was built around 2014-early 2015. Due to the whitelist AND it is a business class machine therefore the chance to upgrade its wi-fi is 50/50 or none. Its supported list

Ralink RT3290LE 802.11bgn 1x1 Wi-Fi and Bluetooth 4.0 Combo Adapter part # 690020-001
Realtek RT8723BE 802.11bgn 1x1 Wi-Fi + BT4.0 Combo Adapter  part # 753077-001
Realtek RTL8188EE 802.11bgn Wi-Fi Adapter part # 709848-001
Atheros AR9485 802.11b/g/n 1x1 WiFi Adapter  part # 675794-001
Atheros AR9565 802.11bgn + Bluetooth 4.0 Wi-Fi Adapter  part # 733476-001
Broadcom BCM43142 802.11 bgn 1x1 Wi-Fi + BT4.0 HMC Combo Adapter part # 753076-001

None of them is an AC card, they use only one antenna. You can use the following option,

               https://www.asus.com/au/networking-iot-servers/adapters/all-series/usb-ac53-nano/

Many similar around, they are cheap no more than $20 and the installation is no longer than 5 mins, 100% work.

Regards.

[TiimeIrre]

Dear @banhien, 

Thank You for Your advice, I haven't thought about that solution; in that case, 2 out of 3 of my USB-ports would be busy (another is for mouse connection), but as a no-way-around solution it is acceptable.

Is there an opportunity to overwrite the "white list" (I don't know, maybe in BIOS or somewhere else) to make the PC accept AC-cards? Or is it reinforced-concretely embedded into the system?

[banhien]

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@TiimeIrre wrote:

... Is there an opportunity to overwrite the "white list" (I don't know, maybe in BIOS or somewhere else)

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@TiimeIrre 

Sorry, I don't know how to re-engineering the machine. Note: Changing BIOS is the shortest way to brick your machine

Regards.