[Elecraft] Advice concerning Update to K2

[C WEAVING]

I am still fairly new to Ham radio. Last year I purchased an old K2 Seriel No. 638 with Firmware 1.04A and I/O 1.02. This rig is a basic model , CW only with the ATU. It suits me fine as low power CW is my main mode of operation.
   
  I have just purchased a firmware update to Rev. 2.04 and 1.09 on Ebay???
   
  I have reviwed the Elecraft website for update info, and feel reasonably comfortable doing the updates, but erring on the side of caution---so little point in updates that improve ssb.
   
  Now what to do??   I have considered each of the following.
   
  1. Do nothing---leave well alone.
   
  2. Just add the Software updates.  Is this useful on its own ?
   
  3. Add software updates and minimal hardware updates that improve CW operation.
   
  4. Add Sotware updates and Elecraft  Kit to Update Rev A to Rev B.
   
  5. As per 4 , but include any other useful updates.
   
  Others have been this way before, so hopefully there is an Elmer who can recommend a suitable approach. I have followed this forum for about 9 months and continue to be amazed at the help and encouragement postings produce.
   
  Thank you.
   
  Colin M3WCK