XHRST-FM

The history of XHRST begins on 91.9 MHz in Rosarito, but the station promptly moved to 107.7 MHz. The station was initially operated by Grupo ACIR and aired several formats under ACIR, including Regional Mexican (La Comadre), Spazio (rock), and Estéreo Sol (English and Spanish adult contemporary). After Rosarito became a separate municipality, the station moved its studios to Tijuana on Blvd. Sánchez Taboada in the Zona Río and took on ACIR's Digital contemporary hit radio format. On March 17, 2009, Digital ended broadcast, and XHRST temporarily entered into a simulcast from XEXX-AM (previously Radio Fórmula), playing classical music.

On May 11, 2009, GRI Radio brought the Los 40 format to Tijuana on XHRST. On October 13, 2009, Ya Párate, the Los 40 morning show, originated from Tijuana for the network. Grupo Audiorama jettisoned all Televisa Radio formats, including Los 40, at the end of June 2017, and it instituted La Bestia Grupera in Tijuana on July 17, 2017. The format lasted almost a full year until the station returned to Spanish CHR on July 9, 2018. On August 8, Grupo Audiorama returned the Los 40 format to the Tijuana and San Diego market.