I have around 20 BAM files and each of them have proper bam header including RG ID, Sample, Library, Platform unit, Description and Platform. I was reading the GATK manual and just realized that the only accepted names for platforms are 454, LS454, Illumina, Solid, ABI_Solid, and CG. But I wanted to be quiet specific when I was converting SAM to BAM and used "Solid5500XL" as the platform name.
I know there are AddorReplaceReadgroups and ReplaceSamHeader coomand in Picard which I can use to edit the BAM header. But it will take some time as I have many large files. Is there an easy way to do so without rewriting the BAM files.