Not in English

The letters of Photius and Cerularius to the Pope can be found in Migne's Patrologia Graeca (PG). Here are the details for each collection:

http://patristica.net/graeca/

Letters of Photius to Pope Nicholas I:
Location in PG: Patrologia Graeca, Volume 102 (PG 102)


Letters of Cerularius to Pope Leo IX:
Location in PG: Patrologia Graeca, Volume 120 (PG 120)


You'll have to locate them in the table of contents and then either translate them or use an AI tool to translate them.  

Here is Pope Leo IX's reply to Michael Cerularius and Leo of Ohrid's initial attack against the Latin Church

https://archive.org/details/patrologiaecurs86unkngoog/page/n374/mode/2up?view=theater

Epistle 100 (Roman Numeral C).  It's fairly lengthy, but is a truly papal smackdown of Michael Cerularius' arrogance

Alas, the only one Bergoglio ever smacks down are Traditional Catholics ... white promoting every possible variation of heretic, schismatic, sodomite, pervert, blasphemer, promoter of abortion, and Modernist imaginable.

Hey, Jorge, whatever happened to Religious Liberty?  Vatican II has "esteem" for Orthodox, Protestants, Muslims, infidels, etc. ... and the religious beliefs of all these are to be "respected" and their rights to express themselves protected.  "Who am I to judge?" -- except that he apparently feels that he's in the position to judge and ruthlessly excoriate and deride and harass Traditional Catholics at every turn.