Flash your phone and How to apply or remove patch using SETool 2 Lite

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Flash your phone using SETool 2 Lite

Step 1: Shut down your phone and open SETool 2 Lite.
Step 2: Choose your phone model.
Step 3: Press the ADD button and select the Main&FS files (.mbn & .fbn). MAIN and FS can also be bin files. In fact the only important thing is that, they're unencrypted.
Step 4: Select the archive with the customization files (.zip).After it is recognized by the program , in the left side will appear informations about the customization.The archive(.zip) contain files from tpa/preset/custom.
Step 5: Press the FLASH button.
Step 6: Connect the usb cable while holding down the "c" button un your phone. Then wait for the process to finish.
Step 7: Disconnect your phone , get the battery out for 5 seconds , reintroduce it and start up the phone.It will appear a screen with "Please Wait...", wait 1-2 minutes and then the phone will start normally.

Sorry if this too much of a n00bish question, but does the 'C' button have to be pressed continously (in Step 6 above) until the flashing process is complete?