Hello everyone!
And I might as well start with saying - Thank You for all the information that has been gathered here! You have been most welcome help!
I can confirm, that at-least one of three Yogas that I have - accepted the BCM94352Z LENOVO FRU 04X6020. Image of the card (one of three cards). Other two will receive their upgrade next week when they will back and available... I purchased the cards here at quite a steep price of ~80Eur per card, but as I had no other choice - that might as well have been a bargain price. This week I received a lenovo service shop email - that the 35020612 link cards are available for pre-order or something - they where not available for order for the last month or so.
At this moment - I can confirm:
> BCM94352Z works in Lenovo Yoga 2 13", Bios version 1.09
> This card (BCM94352Z) has poorer range compared to my ThinkPad L450 Intel AC-7265 (similar to 7260). That said, it has more stable connection and better down link speed and slower up speed. For most uses - this is better. If I have the chance - I will try this card in the L450 and see if it works - compare that the situation is the same. Would love to make dual boot hackintosh with working wifi... :) As sources say - the BCM94352Z is compatible with Mac...
> The Intel 7260 AC (PN: 20200617) from the ThinkPad series - did not work in Yoga - got the unauthorized message at boot. The card I got from the authorized IBM Latvia service shop - but they already warned me that it probably will not work. My hat goes off to them for lending me a card in such a short notice... Thanks!
> The Lenovo service shop was not able to ship to Latvia (LV) - nor to Baltics (LT/EE), had to make an account to the UK address that I had available. In the end spent up to 2 hours in four weeks on phone with the support - and could not get the 35020612 card, at first they said that the Medion Germany had like 10 of these cards, but then I was put on hold for almost a month. Then I received an email saying that these cards are not available for order at this moment. And when I made the order again - after two weeks I got the message that they are finally available, but I already had god three BCM94352Z from ebay.
> Also can confirm that the Samsung SSD drive MZ-N5E250BW works great in all these three Yoga's that I have. Now if only I could get the sff cable for the regular sata drives... that would be something, but at this moment they are still quite expensive.
> With Windows 10 - the only problem that I have with all these three laptops - they don't know how to sleep well... Can not phrase it any other way. At the time of writing there is something seriously wrong with Windows - as the yogas sometimes can not wake up (blank screen), cannot enter the sleep (empty battery). Also the battery life is mediocre 4-5 hours average. The lenovo transition software works OK with windows 10 - that was a nice surprise. Hope the sleep issue goes away at some point - as the laptop is really great otherwise. Minus of-course the dreadful WiFi card. The sleep issues are also present on other manufacturers laptops - so I am accepting that as the price of new technology...
> One of the Yoga's had something wierd going on with the screen - RMA it, link to the problem - here. Notice the brown/yellowish spots near the bottom? Something wierd... Only took more than month for the RMA to complete. Yay!
So all in all - I am pretty pleased about the end result. Love the Yoga, but hate the support. Hope the Lenovo will not make this mistake again in the future. Reminds me of the time when HP made Pavilion series 6 laptops - that had to replace the motherboard once per 3 - 6 months - as it was manufacturing defect (overheat problems) or the time when Apple made defective macbooks (deffective gpu's). Yup - this screw up puts the Lenovo in the grand hall of manufacturing failures.