String on Echo (with the 2 strips ) is stuck and cannot get it out on one side? How do I open the head up?

is it possible you have wound string backwards? this is the usual case for string advancing string .

Sometimes the spring may need extending as over time the bumping makes the spring lose its push tension causing no line advance

I suggest you take all the string off the head and start over. Sounds like it may be twined around itself and won't unwind. I would try that before looking at other things.

How do i remove the hend of the weedeater it is stuck on there. I believe it is stripped

Pull the head off by turning the inner hub counter clockwise while holding the outer head still. Once the inner head pops out, turn it over and look for the string rotation arrow. If you can't find the string winding directional arrow, start the trimmer and determine shaft rotation direction (generally counter clockwise) and wind the string in the same direction as the head rotates when installed.
Pull about 5 arm lengths of string out of a string spool and cut it off. Place the inner trimmer head on an object that will hold it while you pull the string to even lengths through the winding hole (the support brackets of a pickup truck tail gate work well for holding the inner head while doing this).
Begin wrapping the string double wraps in the proper direction, laying them evenly and closely to the previous wrap, working it back and forth as the string begins to build up. Avoid crossing the string over itself more than necessary, the string can weld itself together if the strands cross to awkwardly. Once the string is wound, hold the head with one hand and slide the string through the outer head holes, avoid letting the string come unwrapped.
Carefully place the inner head down into the outer header. Avoid letting the string get caught between the inner and outer head. Once the heads are together lock the inner head onto the outer head by turning it and locking the round knobs into the outer head slots.
You can trim the string or let the trimmer guard do it. If the string doesn't feed it is either wound the wrong way, tangled between the inner/outer head or welded to itself.

For your machine, make sure you are using the Manufacturer's recommended trimmer line. For your model, they recommend using Echo brand .080" Cross Fire diameter line. You also need to insure that when you load the spool with the line, that it is loaded (in the right direction) so it can feed properly.

Here is a PDF of your owner's manual. Please see page(s) 28 for directions and diagrams on this the string head.

http://dl.owneriq.net/b/b429b291-746b-66e4-1d8f-e9ed6237be81.pdf

See page 29 of your user manual here:
http://dl.owneriq.net/7/7dac06e3-cacc-4083-a4da-fb7a073040b4.pdf

Try not to bounce the head unless the rpms rev high. High rpms are a sign that the string is worn short. Bounce the head to dispense more string only when it's obvious you need it. If you tear around bouncing the head on the ground or dragging it (sometimes it's hard not to...) all the time it's going leave two inch pieces of string everywhere because it's being dispensed when not needed. My new Echo was using string up faster than I liked so I tried a small test pack of string with a more aggressive cross section - It worked so well I bought a large roll.

Don't know for sure, but I found manual on amazon, Amazon com echo srm manual so take a look if you want. have a nice day