Trouble code.. C28- P1655- GSX1250FAZ

Hi

I got  problem with my bike..  GSX1250faz 2016.. I did already 69000 and due to pandemic i had 6 month brake with riding.. Commuting to work 90miles per day... One morning red light F1..  so I have checked and I got C28 or P1655

I have check pins ECU to STVA all good, ECU to STPS   all good... Because this model of throttle body STVA is in the middle.. I decide to by from ebay  second hand one.. same problem... then I find STVA eliminator  ST-06 .. but looks like is not for my model and they send me refund... so any advice what else.. I have find at some website  maybe ECU but I don't have spare one to check... 

Any advice??

I have the Healtech STVE-03 and it works great. I took my throttle body apart after removing the blades to get the rod out. I placed a hose between the 2 sides to seal it and a plugged the left side where I removed the sensor. You can see pictures below. 

https://www.twtex.com/forums/threads/for-sale-2016-bandit-1250-throttle-body-w-secondary-throttle-blades-rod-stva-sensor-removed-comes-w-healtech-stve-03-300-shipping.124283/