I agree with you.
The thing is, when Original Steamdeck (from here on OG-SD in short) was released, the hardware was already kind of outdated, since in the last years alot happened hardware-wise. So, the price was kind of overpriced, at least for the 256GB and 512GB models. But Valve tried to stretch the sales for that price for as long as possible.
Then, they started to influence the used-market, by re-selling refurbished Decks for quiet a bit cheaper, but still with full warranty, and most importantly, originally refurbished by Valve themselves.
Then, they didn’t announce the new OLED Deck. They ‘surprised’ everyone. They milked the full price of the OG-SD as long as possible again, since after 14 days, no refund is possible anymore.
Finally admitting, that Valve was behind hardware-prices since longer, they released a proper Deck with 1 TB SSD, more RAM Speed, Oled Display, better APU technology and a better battery. For the same price as the OG-SD.
The mistake was, releasing nearly the same hardware power, but with better feature upgrades, for the very same price as the OG-SD. So, Valve had to reduce the OG-SD prices by alot. Oh and remember, they also involved themselves i the used-marked. So, they reduced the refurbished OG-SD prices by alot, too,
Now, another big problem: All of this happened within barely over 1 year. Your OG-SD is still ok power-wise, but the resell-value is now down as hell.
What impression does this leave on me: Valv doesn’t care about the customers, and the resell-value of used OG-SD. They wanted to milk as much money from the OG-SD as possible, before announcing the Oled Deck. Their only plan is to overrun the market with their lable and product, by trampling over the OG-SD price-value.
I think they never released a 3.5.5 recovery image. The last one is very old from 2022 and the most recent one is from 18th nov 2023, according to its file name it is 3.5.6.
There doesn’t seem to be any other image between these two.