I think i found the solution.... i have a z1 compact and backed-up my data for a restore got the same issue "not enough memory to restore" i even freed so much space (6gb!!) Sony Bridge for Mac showed i had only freed up 1.5gb about 5gb less!! but then i believe it had to due with reading my sd card so i removed it and voila!! now sony bridge says i have 4gb of space (even though its still 6gb but im not complaining if itll just restore!!) so remove your sd card and see how it works after that hope this helps guys!
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