There is a new improvement made in the new software release to improve the channel search efficiency, which required the TV channels to be reinstalled when you update the TV software from version TPM61E_2.11 (or older) to version TPM61E_2.14 (or later).
NOTE: After you have reinstalled the channels, you can rearrange the channels to suit your preference in the channel grid with the REORDER feature in the options menu.