Thread: Need help with Street Pilot 2720

If it can see it and communicate for a several seconds that might be enough to load that tiny map and over the corrupt NA. It very quickly wiped the US map completely and loaded Rarotonga on mine in a matter of seconds. Keep trying, being as quick as you can. To maximise your chances, have the BAT file visible ready with curser hovering to double-click, 2720 turned off but connected to PC. Turn it on, when you hear the Windows connection tone start the bat file. If you hear the disconnection tone, abort it and start over.

You can upload the word doc [or the images themselves] to a free site like [Only registered and activated users can see links. ]. No need to register. Compress to a .rar, or .zip first for quicker up and dn. If you pack it enough you might still be able to attach it on our server, it'll load if 5MB or less.

Thanks for that info flagmax. I'll have a play with the header info for the rgn made from gmapprom.img for primary map.

Yep knew about the use of RGN_Tool, that's how i made the Pacific basemap into an rgn file which successfully flashed to region 3. I fluked the region change in hex with the basemap, changing the number at 0x32 from 33 to 03 resulted in the Section number appearing in RGN_Tool as xxxx [unidentified] which happens to be correct. I confirmed this by reverse-engineering the Atlantic basemap .rgn which is available here: [Only registered and activated users can see links. ]. When i got the img file [which then works fine], i renamed it to .bin and loaded it to RGN_Tool and remade the RGN. I then compared the 'homemade' one to the known good in hex and found only the one difference 33 instead of 03 at offset 0x32. Fixing that resulting in the files matching of course, so i then did the same with my self-made Pacific basemap rgn and flashed it, works fine as reported in P7. Unfortunately changing 0x32 to 49 with the detail map rgn doesn't result in a successful flash as also reported in P7. Could it be to do with the Section number requiring editing as well? I can't find a detail map as an rgn anywhere to compare any further differences. Do you know where the Section # can be edited by any chance? I'm prepared to experiment with Section # to find the working one. It can't be overwritten in RGN_Tool nor can Region # of course.

I have neither programming skills or background in software so if you can enlighten me, use small words with much soothing cooing please.

G'day kunix, thanks for replying. It's OK with the dangerous stuff, i'm doing all the testing on a 'half-broke' SP2790 which owes me next to nothing. I know i was being cavalier about this but that's because there was no immediate response so i thought i'd 'have a go'! I think i've already blocked part of rgn49 by trying to flash a detail map gmapprom.img as RGN with region changed in hex from the RGN_Tool default 33 to 49. In answer to flagmax I don't know what i'm doing with hex to be honest, as i said i simply lucked-in with the basemap region # change, but with the primary detail map it's changed ok to 49 from the default 33 set by RGN_Tool but i suspect to the incorrect Section # because i now can't flash a secondary map gmapsupp.img to the unit, that is, it flashes apparently but then the map details aren't shown on the boot screen nor shown in the unit's menu of selectable details maps. That makes me suspect that both primary and secondary maps share rgn49 and i've blocked the section which is used by the secondary map. Here's the before and after for my self-made detail map RGN file for Rarotonga:

[Only registered and activated users can see links. ]

So nothing else has changed in the file other than the region # from 33 to 49, exactly as i did with the Pacific basemap where i successfully changed 33 to 03 and it works on the unit. But the change to 03 in the basemap rgn results in the Section showing in RGN_Tool as XXXX [unsupported section identifier] and 'unknown.bin'. But 33 and 49 have a defined Section, 3305 and 4905 respectively yet there's no other difference in hex as shown above, however the section name is different, dskimg.bin for 33 and section4905.bin for 49 [i didn't name the bin files used for the rgn making as that, it was gmapprom.bin originally]:

[Only registered and activated users can see links. ]

So my bush logic tells me that RGN_Tool has nothing to do with setting the Section and by my changing the Region in hex the same 'default' (05) is maintained for both Sections, 3305 and 4905. So i've maybe flashed the Primary map to the wrong section which has now somehow 'blocked' me loading the Secondary map. So what is the right section and how do we change it? You've mentioned makergn.exe kunix, and i mused about that for setting the correct region but i know nothing about it. I think maybe you even spawned it, but even if you didn't you'd know how it works backwards:

Originally Posted by Neil

...............
Now we only need to find out how to erase rgn49 to wipe the primary map. I suspect there is a way to make a flashable RGN from an IMG file renamed to BIN. .............. I can load the map bin to RGN_Tool but i cannot override the section or the region setting which defaults to 33 when we need 49 ..............

Maybe by making an rgn file with something such as makergn.exe could sections and regions to be changed. But now i'm just blathering, i've not used it so i simply dunno. There could also be a program like SendMap20 which can erase the primary map [it'll only erase the secondary map gmapsupp.img].

Need Expert help here. C'mon you guys from the x-Eastern Block 'n' Central EU!! It won't kill you to help a couple of Westerners out .......

After making that post and getting no quick reply even though i knew who'd read the thread i set about playing with my 'home baked' basemap rgn file, and so emboldened promptly cocked-up the primary map rgn file and flashed it to section 4905 which partially crippled my 2720's rgn49.

So, i don't expect you guys to give me a lesson in hex editing but i'd like to know if anything further can be done with the primary map rgn file in hex to set the correct section # [wotever it is], or, if that's a really stupid question, after you've stopped laughing point me to some easily understandable tut on using makergn.exe and please tell me, if you know, what section i need to set for the primary and secondary maps because i'm now almost sure that they both are flashed to rgn49. While you're at it can i fix my unit's rgn49 which now won't flash a secondary map gmapsupp successfully? That's not so important i can live with that because i can always combine maps and flash as gmapprom primary map anyway.

My unit's gonna die itself eventually anyway i reckon from the intermittent screen-freeze problem. But if you can say how to erase 49 entirely or make a working flashable gmapprom.rgn file we at least can fix the OP's 2720 i think.

@technit
The General has arrived to lead the Cavalry. I'm hoping this isn't the Battle of Little Bighorn figuratively for both our 2720s ...... How's the BAT file going?

[Only registered and activated users can see links. ]No luck with the BAT file, unit just doesn't give WebUpdater enough time :-( Must be on tial number 80 by now

Ok, stand by then. I reckon the only way is to load a correctly modified gmapprom.rgn or erase rgn49. Latter may be risky, if any essential stuff other than maps is also in there [but i doubt it, probably exclusively for detail mapping].

Somebody somewhere must already know how to do it or kunix will find a way i'm sure.