Model: eTrex 20x/30x | HWID: 2250 | SWVS: 210 | MAP: Yes | GMA: Yes | MSV: Yes | GVS: --- | File: D:\Garmin\Firmwares\eTrex\Etrex 20x-30x\eTrex20x_30x_Webupdater__210.gcd
Model: eTrex 20x/30x | HWID: 2250 | SWVS: 106 | MAP: Yes | GMA: Yes | MSV: --- | GVS: --- | File: D:\Garmin\Firmwares\eTrex\Etrex 20x-30x\eTrex20x_30x_Webupdater__106.gcd
Model: eTrex 20x/30x | HWID: 2250 | SWVS: 230 | MAP: Yes | GMA: Yes | MSV: Yes | GVS: --- | File: D:\Garmin\Firmwares\LAST\eTrex20x_30x_Webupdater__230.gcd
Model: eTrex 20x/30x | HWID: 2250 | SWVS: 210 | MAP: Yes | GMA: Yes | MSV: Yes | GVS: --- | File: D:\Garmin\Firmwares\LAST\eTREX\eTrex20x_30x_Webupdater__210.gcd
Model: eTrex 20x/30x | HWID: 2250 | SWVS: 200 | MAP: Yes | GMA: Yes | MSV: --- | GVS: --- | File: D:\Garmin\Firmwares\eTrex\Etrex 20x-30x\eTrex20x_30x_Webupdater__200.gcd
Model: eTrex 20x/30x | HWID: 2250 | SWVS: 106 | MAP: Yes | GMA: Yes | MSV: --- | GVS: --- | File: D:\Garmin\Firmwares\eTrex\Etrex 20_30\Originales\eTrex20x_30x_Webupdater__106.gcd
Model: eTrex 20x/30x | HWID: 2250 | SWVS: 210 | MAP: Yes | GMA: Yes | MSV: Yes | GVS: --- | File: D:\Garmin\Firmwares\GCDs\eTrex20x_30x_Webupdater__210.gcd

the las firmware versions have MSV check, it necesary patch firmware.