Hope this table ia accurate and covers most of the devices available. Feel free to feedback any mistake

Takes the fun right out of it especially for a new person that just spent a ton of money to start racing wonder why tracks are closing left and right

I do not know why you post your complain here. If you did get new stuf you should already have a RC4(-hybrid) transponder.
And regarding the software update, that is not the reason why tracks are closing. It may not be a friendly step of Mylaps but on the other hand drivers had enough chances to exchange their old and even non AMD transponders for an original RC4 for a special price.

Regarding a downgrade, I think that must always be possible if you have the HEX file, open the machine and program it directly on the processor through the onboard communication port.

Has anyone seen a solution to downgrading an RC4 box from the 4.5 firmware to the 4.4 firmware?

Your firmware is unique to your decoder's SN. You have to ask MyLaps if they can provide you a 4.4 firmware for your decoder. You can't use the firmware from another decoder.
If you get one for your SN, a downgrade is possible.
Andreas

Hi All,

We have purchased a decoder with FW 3.3 on it, and we could not get it to work with neither RC3 nor RC4 transponders, nothing with MRT either. The decoder screen showed no detection of the loop. We just bought an original loop and coax cable, so that is not the problem. I suspect it is settings, but more likely firmware issue ( we bought it from a cart track). Can anyone tell me, if I can somehow upgrade the firmware to V4.4 or below, and if FW 3.3 should be compatible with the current RC3 transponders?

Thanks a bunch.

Quite likely the cart transponders use a different protocol, so your decoder might not be compatible with RC transponders.
Andi

i was trying to contact amb after logging in to the speedhive page via the contact, but i couldn't submit my inquiry after tping up my questions, does anyone know what is the support email that i can send please?
the track is required to upgrade to 4.5 firmware and we are kind of forced to upgrade by trade in our older version of amb, mine are amb DP, which can only use at 4.4, i would like to seek if there is any option to retain my numbers.
amb is offering trade in discount for that, but i just wonder how many options i have?
thanks

Hard to find an email adres however support@ or info@ is common used.....

Anyone know if the RC transponder trade in to RC4 offer at the Mylaps speedhive shop for older AMBrc transponders is still valid, and if they have stock? The website says until November 30th, 2019, but I can still add it to the cart and I assume pay for it. Don't want to get stuck in a situation where its not valid or back ordered forever.

how do you get a custom number rc4 transponder guys?

call amb with your credit card you just order 1.
trade in has expired

Thank you dude!

bro you re in my mind!!!!
just lost 3 amb dp - 200 USD out of no where now to replace them!!