STM32F105 64 pin bootloader

[sklindt]

Hello

I have been asked how difficult it will be to create a custom bootloader for the STM32F105.

We are for some reason using the 64 pin version of the chip and from the AN2606 i can see 

"""""

Workaround
• For 64-pin packages
None. The bootloader cannot be used. 

""""""

So i guess we will have to develop our own bootloader or switch to 100 pin package.

But what would people in here suggest? 

[Tesla DeLorean]

@STOne-32 Can someone confirm the "A" marking on this device, none of the documentation I can find addresses this designation. Could be fake I assume, but seen other images of similarly marked parts, and product from different diffusion sites have different mask sets.

https://www.mouser.com/PCN/STMicroelectronics_MDG_21_12790.pdf

And PLEASE PLEASE get someone to FIX the user call-out dialog, so it can find more than 5 people, scrolls, and has some effective wild-card searching mechanics.

[STOne-32]

Dear @sklindt @Tesla DeLorean ,

Indeed, first point is to check the authenticity of this MCU , we did not put RevA devices in production and was an early version . To do so you need to connect ST-Link and have a dump on DeviceID, RevID and Unique ID registers . If you can share. 
Cheers,

STOne-32