Old version gt3x files

[jhmigueles]

Serial number starting by "MRA" and firmware version == "2.5.0" gets detected as an old_version gt3x file. The package run into error:
Error in if (est_n_samples > samples) { :
missing value where TRUE/FALSE needed

When debugging the function locally and manually setting up old_version to FALSE, I get the file correctly read with no errors. Probably misclassication of old versions and they should be firmware < 2.5.0 instead of firmware <= 2.5.0?