XPR 4550 Programming ugh

[italiasown]

 I.
Just purchased a Motorola XPR4550. I am having the worst time trying to program it. I purchased an authentic cable and have the software.But when I plug the u s b cable into the radio it is not recognized. I have seen a lot of posts regarding this but no way to actually fix it. Usually when a USB is plugged into a port, it will show up that there is a connection. This cable does nothing. I have tried several cables.So I believe it is something specific to the cable that is making the computer not recognize it. My XPR firmware is R011217 and i was using the Motorola CPS 16 (build 828). I am not sure if I am missing a driver or something but this does not make sense to me at all. Any assistance would be greatly appreciated.

 

[clbsquared]

Even though it’s a USB cable, it uses a network connection. Turn your WiFi off or disconnect your computer from the internet. Do the radio in this order. Open CPS , turn your radio on, connect the cable to the radio, connect the USB end to your computer. It may take a few seconds but you should get a “new network” pop up.

 

[italiasown]

No new networks popped up that i notice. Firewall is off. Not sure what the name of the network would be if i am missing it. Neither the computer nor the radio show any indication that the cable is even connected, and i have tried 3, one of which was from motorola.

 

[K2NEC]

Id suggest trying a rear programming cable however seeing as it's mounted in a console that's not exactly an easy option

 

[W6VVM]

Id suggest trying a rear programming cable however seeing as it's mounted in a console that's not exactly an easy option

Yes, or remove the extension cable from the radio itself and connect your USB cable directly to the radio (not the head unit).

I had an extension cable somehow go bad awhile back. The round plug one, not the one that resembles an old parallel port. It didn’t fail completely, so a standard mic still worked, but the backlit DTMF mic, and programming cable, would not work when connected directly to the head unit while the extension was used. Replacing the extension fixed the issue.

Also, I often notice that the first time I connect an XPR 4550 to my PC, it doesn’t establish a connection, but simply unplugging the USB cable and reconnecting it solves it. Happens pretty often but the disconnect/reconnect always solves it for me.

 

[dickie757]

Are you twisting the lock ring "closed?" I have noticed some radios will not connect until it locks.

And I also suggest going into back. It is really easy to make the cable from scratch. I used a long APX usb cable.

 

[dickie757]

Id suggest trying a rear programming cable however seeing as it's mounted in a console that's not exactly an easy option

Well, there's only one screw holding it, so 75% done already!

 

[kayn1n32008]

Are you twisting the lock ring "closed?" I have noticed some radios will not connect until it locks.

And I also suggest going into back. It is really easy to make the cable from scratch. I used a long APX usb cable.

Yep, 100% agree. I've always used a rear accessory cable to program my XPR5550. Never failed.

I use a home made cable. A $5 mouse donated it's USB cable, a friend had the accessory connector and pins and assembled it for me. It's never let me down, and I've used it to read and write XPR8x00 repeaters as well.

There are no electronics in the cable, everything is in the radio itself. If that doesn't work, then there is likely something else wrong with either your computer or your radio.

 

[italiasown]

No new networks popped up that i notice. Firewall is off. Not sure what the name of the network would be if i am missing it. Neither the computer nor the radio show any indication that the cable is even connected, and i have tried 3, one of which was from motorola.

I figured it out, thanks all who assisted. The issue was that the programming cable doesnt work via the mic port on the remote head. I need to plug the programming cable into the port on the radio itself and it works

 

[K2NEC]

I know you said you bought an authentic cable however I know I've had issues with some GCAI cables working with XPRs. Despite being the same connector, I could only get some to work on XTL/APX and not XPR

 

[italiasown]

I know you said you bought an authentic cable however I know I've had issues with some GCAI cables working with XPRs. Despite being the same connector, I could only get some to work on XTL/APX and not XPR

I tried several cables, from aftermarket to genuine. I think it was the port, although my friend said his model programmed through the remote head 🤷‍♂️

 

[jhale1]

What has worked best for me was similar to what @clbsquared said.... I disable all network adapters in my laptop & can usually get the 4550 to read (may take a few USB cable unplug & replugs). If its gonna work, the radio will show up as a new network adapter. Once it reads the first time, if I update the radio firmware I can read it every time after that with no issue. If I just make a code plug change, then the radio usually has trouble reading again after the power cycle.

 

[n3obl]

I have seen people have issues with questionable programming cables. The OEM cable is not terribly expensive for these and should allow programming from the mic jack.

 

[natedawg1604]

I am having this exact issue with a 4550 (with firmware v. 1.12.17) I've owned for several years. Recently a windows 7 computer I've used for several years to program several 4550s stopped recognizing the programming cable. For several years I used a homemade rear cable, when that unexpectedly stopped working I got a rear and front cable from BlueMax 49ers. However the computer isn't recognizing either cable. Oddly, the CPS (16, v. 828) on the same computer still works fine with a 6550 portable. I tried disabling network connections and unplugging all other USB cables, as well as un-installing and re-installing the CPS, still nothing. The 4550 itself works fine, and the physical connectors seem fine.

Is there any way to isolate whether I have a radio or computer issue?

 

[VK6NCB]

Yep, 100% agree. I've always used a rear accessory cable to program my XPR5550. Never failed.

I use a home made cable. A $5 mouse donated it's USB cable, a friend had the accessory connector and pins and assembled it for me. It's never let me down, and I've used it to read and write XPR8x00 repeaters as well.

There are no electronics in the cable, everything is in the radio itself. If that doesn't work, then there is likely something else wrong with either your computer or your radio.

fun fact, if you have the apprentice assemble ignition sense cables, they will mess some up, and put the plug in the opposite corner to where they are supposed to be.
the radio will still function normally, but it kills the USB chip in the radio, and makes it impossible to program without the radio taking a vacation to motorola.

I may have learned this lesson the hard way, after spending waaaaay too long trying to reprogram a radio.
and I didnt kill the programmability of a second radio at the same time. nope, that wasnt me....

 

[troyken]

29

• Aug 2, 2025
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• #15

Yep, 100% agree. I've always used a rear accessory cable to program my XPR5550. Never failed.

I use a home made cable. A $5 mouse donated it's USB cable, a friend had the accessory connector and pins and assembled it for me. It's never let me down, and I've used it to read and write XPR8x00 repeaters as well.

There are no electronics in the cable, everything is in the radio itself. If that doesn't work, then there is likely something else wrong with either your computer or your radio.

fun fact, if you have the apprentice assemble ignition sense cables, they will mess some up, and put the plug in the opposite corner to where they are supposed to be.
the radio will still function normally, but it kills the USB chip in the radio, and makes it impossible to program without the radio taking a vacation to motorola.

I may have learned this lesson the hard way, after spending waaaaay too long trying to reprogram a radio.
and I didnt kill the programmability of a second radio at the same time. nope, that wasnt me....

I am experiencing this exact problem on an XPR-5550E radio. Same programming cable , new drivers the whole bit. Great support on that by the way. I just printed the rear connector pinout and the Ign sense wire pin 25 , if improperly installed, will connect to the D+, pin1, on the radio. Those are the programming pins I believe. The radio works fine otherwise but I cannot establish connection with programming computer via the mic jack. I will have to check as the rear connector is being used on this truck.

If this is the case is the rear jack inoperative for programming too?

This radio was installed at the time the truck was built ( 2017) by a professional radio shop.

 

[VK6NCB]

29

• Aug 2, 2025
• 
  
• Add bookmark
• #15

fun fact, if you have the apprentice assemble ignition sense cables, they will mess some up, and put the plug in the opposite corner to where they are supposed to be.
the radio will still function normally, but it kills the USB chip in the radio, and makes it impossible to program without the radio taking a vacation to motorola.

I may have learned this lesson the hard way, after spending waaaaay too long trying to reprogram a radio.
and I didnt kill the programmability of a second radio at the same time. nope, that wasnt me....

I am experiencing this exact problem on an XPR-5550E radio. Same programming cable , new drivers the whole bit. Great support on that by the way. I just printed the rear connector pinout and the Ign sense wire pin 25 , if improperly installed, will connect to the D+, pin1, on the radio. Those are the programming pins I believe. The radio works fine otherwise but I cannot establish connection with programming computer via the mic jack. I will have to check as the rear connector is being used on this truck.

If this is the case is the rear jack inoperative for programming too?

This radio was installed at the time the truck was built ( 2017) by a professional radio shop.

Yes. It kills the USB chip and you cant program by either the rear 26 pin plug or the mic port.

 

[N4KVE]

I figured it out, thanks all who assisted. The issue was that the programming cable doesnt work via the mic port on the remote head. I need to plug the programming cable into the port on the radio itself and it works

Had that exact problem with a trunk mount MCS2000. I could program front mount 2000’s, but not this trunk mount radio. I made a cable to program through the acc connector, & that worked fine. Don’t know why, but that solved the problem.