Need Precision M4600 A03 BIOS

 My M4600 has Bios v. A02.   Instructions for upgrade say I need A03 before updating to newer versions.   However your site does not provide a link to A03!  

https://www.dell.com/support/home/en-us/product-support/drivers 

Any tips on finding A03?   A search of this group did not turn up anything. 

Thanks.