Stock recovery for the Samsung Galaxy Tab A SM-T550, T555, P550, P555, T350, P350, T355, P355 is now available for download. Stock recoveries are useful when you want to bring your tablet to stock for warranty purposes or the custom recovery that you had previously installed has got corrupted.
SM-T550/T555/SM-P550/P555 stock recovery download link:
SM-T350/T355/SM-P350/P355 stock recovery download link:
To flash then, you will require ODIN. After that, put your Samsung Galaxy Tab A in download mode by pressing and holding down power and volume down button for few seconds; connect it to the computer and flash it using ODIN app.