My Rm Adu 138 Remote Control, I Stop Working ,,, As I Can Reset Or Configure It

Sorry for your problems. It's possible but unlikely that your remote could be repaired, and I don't have enough information to suggest a repair. For some reason remote control failures seem to be more common than failures of the systems they control. You can probably get a replacement from Sony. (Use the contact information here--https://www.contacthelp.com/sony/customer-service.) Otherwise, a good source for remotes is https://www.remotes.net/. For used, I recommend http://www.searchtempest.co,* which will provide many useful filters, will let you search locally or country-wide and even globally, and covers Craigslist, eBay, Amazon, and many other sources.

*For SearchTempest, you may want to use a free tracking program like https://www.followthatpage.com/, to save you from having to repeat your search over time.

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