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Did you try an unlocked map? as I'm sure your device will work fine,but you didn't say what maps?

HWID 1582
<Model><PartNumber>006-B1582-00</PartNumber>
<SoftwareVersion>550</SoftwareVersion>
<Description>nüvi 2597</Description>

nuvi 2xx7 and 2xx8 | 1582 | 550 | MAP: Yes | GMA: Yes | MSV: ------ | GVS: Yes | File: nuvi2xx7and2xx8_550.gcd


Legend:
MAP: Yes - it verifies the presence of a valid unlock code, to unlock an .img you can simply use JetMouse keygen.
GMA: Yes - it verifies the FID limit (2200) and the presence of a valid *.gma, to unlock an .img you enough to use the old gimgunlock-0.03 (without MapSigPatch) or one of its derivative.
MSV: Weak - it verifies the validity of map signatures in a simple way, you can unlock an .img using gimgunlock-0.04 (without patching your firmware), but in case of unicode maps (CP65001) you must modify the CP value (see the Temporary authentication of Unicode maps*).
MSV: Strong - it verifies the validity of map signatures more complicated way, in this case you need to patch your firmware and unlock an .img using any correct unlocker.
GVS: Yes - it verifies the validity of firmware signatures, you have to use Updater.exe to install the patched firmware for the first time.