In mid-February, Our Lady of The End Times has given more details about the coming technological blackout, its causes and effects, and how we should prepare for these events.
The message published on February 17, 2018, clarified among other things that what would leave man without technology will be solar storms driven by the solar wind, in a context of greater radiological activity from the sun. This will interrupt radio communications, electrical services and technologies that rely on electricity to run. This had already been mentioned in the past:
My beloved, Humanity does not think of these contingencies coming from outside the Earth, nor of those which it receives from Nature itself. Our Lord Jesus Christ to Luz de María - Jul, 14 2016
You know that soon, very soon the sun star will attack the whole Earth and man’s technology will be reduced to ashes. This will be chaos for man, since you depend completely on technology. You must learn how to survive without this technology that has made you easy prey for satan, because it has clouded your thinking, has hardened your hearts to the point that some are zombies, wandering around fully controlled by all the negative effects of science and a misused technology. Blessed Virgin Mary to Luz de María - Oct, 27 2016
Among scientists it is usually considered that these types of risks would affect mostly household appliances plugged into the electrical network, being null or reduced regarding portable devices or during the time they are disconnected, but this message seems to speak of the same risk for all devices, that is, the end of technology. It is important to be able to use the web during this time to collect all the useful information that we might need if this tool were missing, and have it printed or written.
Humanity’s lack of awareness is stirring up violence against itself, and this violence is expanding like a plague from one country to another until it becomes uncontrollable. You will see how difficult it is for man under repression to survive without what is necessary, and yet at the same time if you have faith like a mustard seed, you will not lack what is necessary for you to survive, if this is My Will. Our Lord Jesus Christ to Luz de María - Aug, 03 2017
It also has indications advising to have in our houses a minimum reserve supply (without exaggerating) with edibles and water to survive the hardest moments. Specifically, it is convenient to have canned products with long expiration dates as well as non-perishable products and bottled water. Best would be to achieve some degree of self-sustainability to be able to produce our own water and food. This can be accomplished with an organic garden and collecting rainwater as most communities originally did.

It is advisable to learn about basic methods for filtering water.
Just as it is necessary to nourish the body, so it is to nourish the spirit. Therefore we are asked to have the Holy Scripture, the daily Gospel to meditate, to use sacramentals, to have a small altar and prayer books, since we will not have access to them by this means (web).
This is the complete message: